PVP Laugh

[Ither]

I need some help;

I was in a dungeon with a hunter who was laughing at certain times and I asked him why; he said it was a macro for PVP.

This led me on to an idea for my ungodly rogue who pawns people. I want the same, but I noticed he didn't emote or say or do anything.

I've scoured the API and I can't figure out how in the heck he was gettng his toon to laugh without showing anything in chat.

Anyone know how?