Also known as the TAG. :D
So, here's how it's gonna go: You post any cluster of letters, it could be RPG, FOR, TURD, and so on, and the next poster posts what each letter might stand for, then he/she posts his cluster of letters.
Someone posts "ADD"
Someone else posts "Anonymous Dum-Dum", or something like that, then leaves a space, then puts some other abbreviation.
Got it? I'll start it off: