Update first line of SaySapped.toc to
## Interface: 80000

and replace the contents of SaySapped.lua with this to fix it for game version 8.0.1:

local SaySapped = CreateFrame("Frame")
SaySapped.playername = UnitName("player")

SaySapped:SetScript("OnEvent", function(self, evt)   
    if( evt == "COMBAT_LOG_EVENT_UNFILTERED" )then
        local _, event, _, _, sourceName, _, _, _, dstName, _,_,spellId = CombatLogGetCurrentEventInfo()
        
        if( (spellId == 6770)
            and (dstName == SaySapped.playername)
            and (event == "SPELL_AURA_APPLIED" or event == "SPELL_AURA_REFRESH")
            )then
            SendChatMessage("Sapped","SAY")
            DEFAULT_CHAT_FRAME:AddMessage("Sapped by: "..(sourceName or "(unknown)"))
        end
        
    end
end)

SaySapped:RegisterEvent("COMBAT_LOG_EVENT_UNFILTERED")
DEFAULT_CHAT_FRAME:AddMessage("SaySapped loaded")

In reply to dslater:

Great addon, using it years later!

Just a fun thing - you can edit SaySapped.lua easily and change this line:

SendChatMessage("Sapped","SAY")

to for example:

SendChatMessage("{triangle} - Sapped - Flare/AOE ! {triangle}","SAY")

Updated yaaay

 i've used this faithfully since TBC and my heart just leaped a little to see it updated :)

any replacement for this addon?

Preach!

open say sapped.LUA and change sapped with 

"{rt8}  Sapped  {rt8}"

can you add some skulls at the beginning and the end : (skull) Sapped (skull) 

Bump for an update to 5.2, love the addon. Thanks!

Great little addon. Very useful in BGs

Can we get an update for this soon? I love this addon.

Please update

Please update this to 5.0.5.

To the guy who tried to argue that most people wouldnt say sapped when they are sapped. I must disagree. In actual combat we warned eachother of everything we saw, knew about, and even suspected. It wasn't a case of... "oh there's a sniper in that tower but I better not say anything, that wouldn't be fair"... really? wtf?

If your arguement is that nobody should be able to say anything after they have been bonked on the head because it isnt realistic...THIS IS A GAME> people can't really hide in plain sight while moving around either.

If truth be told if someone wanted to be more like actual combat they would make an addon that not only said sapped but said it in raid chat and gave coordinates of the location and the time you were hit...

I use WeakAuras to accomplish this same thing. It has "SAPPED" in big, red letters on my screen and yells, "I'm Sapped! Rogue nearby!" WeakAuras is an easier to adjust (IMO) and more efficient alternative to PowerAuras. I apologize for having to put this on your addon page, but this addon is very inefficient for what it's meant to do.

You can import the mentioned WeakAura using this string:

dWZCcaGArPA9Ik2LOsBtkzMqLMRuPztsFcQOttQBtPomHDkvTx0Ub1(jr(POe)fq)wrltPUjuHbtcnCqoOu4YsoMcNdileQQLcvzXsPwoepKeLNQ6XuPNt0TOKMQitwjtx4IsfxvukpJeCDa2ifzyuyZqz7II6JIcnnQ4Zq67IImsrbFJIA0srJxuLtsjoljQUgqDEQQdjQQXrvETOKMdM418wGJcbt4wDT4oHLDB0wRQdFGxaXl5h56KlyEB(f)IjESjCCDof73o8Ut1jctSFZEd2Ran5aEp2Tm8m2kygKzqBIzfShd(LwcPk8tvEb)fqq1IhPq1t4KpuXhvEbVWn0tyjt8YqGemXBxsPaTag(qfVY7GlU8Rjq7skfOfXN3UKsbAXBbN2kPOuabvR8vsr8MOakLueUeiT9ZNbdE9I)ciOAXNDaYqJ5ZRSo9Po4XhiAu0cHjEyHDjzI9d(lGyWVQ2aWWs(qfFgAGhomLnC5DbiJPnWM6vXhA7AXGpt6v0KMaRGHZ2XWWZBS92JweZQtlESjCWJViN5mRcEya2jenkAHiz)GVzPrBg0ulhdWJ9yV3dWdZGatmRoE8(zbdtwbnz1SN3ydc02SbiJXWBqmRoG4vNIft8aKfqxvHus85rMQft82audntmyW7QkKsM4LAyu1IhhnYyhgm4fRLo0tyHkWarJIwisMyWGxWe)fq8wGJcbt4wDT4oHLDB0wRQdFGxaXGpZSF4yyWGea

update for 4.3 ?

So my reply got censored. Then let me post something in a more civilized manner. This addon is one of those addons that spoils the WoW gameplay as it was meant by the developers. A Rogue (or any stealthed class) is a class which relies on surprise and shock and awe. This addon manages to take that away from the Rogue and it is being used by players of questionable morality throughout the realms, giving them an unfair advantage over Rogues. Most people won't think of saying sapped when they get sapped, cause they are surprised. As they should be, because this is how the Rogue operates. Other classes have advantages which gives them an edge, but the Rogue's edge is being diminished by this addon. Now if you were to have a macro that would shout/say sapped in any chat you want it to, but only if you manually press the macro to do this, then this would be a more realistic and not to mention FAIR approach to the advantages this addon is offering. If the developer would consider what I said and has some respect for WoW and it's gameplay, then perhaps he could adjust his addon to do exactly that; manual activation of saying the word: sapped.

Finally here's the explanation of the term cheating as found on Wikipedia, since an addon like this approaches the meaning of this word. Please note the underlined text.

In video games, cheating can take the form of secret access codes in single-player games which unlock a bonus for the player when entered, and add-ons or exploits which give players an unfair advantage in online multiplayer games.

I rest my case

QQ.

TL;DR