Definitions by n00b@r0vsk!

ROFLOLMAOMGWTFBBQ 

rolling on the floor laugh out loud laughing my ass out oh my god what the fuck barbeque

usually an "extension" of lol, or it can also be an expression of shock, surprise, etc.

Person: SHIT!!!!!!!!
*Tactical Nuke*
Person: ROFLOLMAOMGWTFBBQ

ROFLOLMAOMGWTFBBQ by n00b@r0vsk! October 19, 2010