In online games OMGFTWBBQ is often used to describe the sudden surprised death of an opponent. MOG - Oh my god, WTF - What the Fuck, BBQ Barbecue.
It is a humourous expression of surprise at a victim totally pwnt in no time flat.
An example might be from the space game Eve-Online when a Battleship camped on a gate targets and destroys a nub that jumps through. The gate camper might say "I OMGWTFBBQ him before he could blink!!11!!11"