The addon has 154 lines in total. 20 of them are Challenging Shout lines, and that shout no longer exists in retail, so this version actually uses 134. I've written "over 130" in the description to keep it accurate. Ready to paste into CurseForge (it accepts Markdown):

RP Shouts

Give your warrior a voice! Every time you use a shout, your character yells a random line to match: heroic roleplay, silly jokes or something a little odd.

Over 130 lines, including

• Battle Shout: "Stand fast, brothers and sisters! Steel your arms!" / "My sword has a name! It's Gerald! GERALD HUNGERS!"
• Demoralizing Shout: "Your weapon is so bad it shows up grey!"
• Intimidating Shout: "Run! I've just remembered I haven't bathed in a week!"
• Rallying Cry: "Rub some dirt on it and keep swinging!"
• Thunderous Roar, Piercing Howl and oth...A light drizzle, but a STORM!"*

Lines never repeat twice in a row, and can include your target's name, your name or your faction.

Commands

Settings are saved per character.

How it works

The game only lets addons /yell or /say outdoors straight after a key press or click. RP Shouts saves the line when your shout goes off and sends it on your next key press or action bar click. In combat that's almost instant. If you don't press anything within 5 seconds, the line is skipped, so you never yell out of nowhere.

Write your own lines

Open Lines.lua in the addon folder, edit aders:

• %t: your target's name ("you all" with n
• %n: your character's name
• %f: "the Alliance" or "the Horde"

Back up your Lines.lua before updating, because updates replace it.

Compatibility

Made for retail WoW (Midnight, 12.1.5). Also available for WoW Forever.

Please report bugs or send line suggestions in the comments!

The "Also available for WoW Forever" line is Forever version too. If it'll be on its ownCurseForge page, add a link to it there; if you're not publishing it, delete that sentence.