BoomMod

Keep everyone informed of your critical hits.

/boom to toggle the addon on and off.

When Boom is on, you will automatically /emote a message informing anyone nearby of your critical hit - the amount, the spell name, and the target. Boom will also play a sound to keep you informed of your critical hits as well.
Boom has a 5 second internal cooldown by default.

Boom is configurable via Options → Addons tab → Boom.

Credits

• The original BaM Mod
• Warcraft Wiki - API_CombatLogGetCurrentEventInfo for the original example code.
• Cover image from Nuclear Explosion Fantasy by Maxwell Hamilton on Flickr