The very pleasant and quite surprising sound used by the man behind Ventrilo Harassment. This can be used in every day situations also.
Harassment:
-Guy: Wow, your mic's really, really loud.
-Harasser: WTF BOOM Everyday(on vent):
-Jim:Yo, he kicked me from the guild and I was like WTF?!
-You:WTF BOOM
Similar to getting owned, 0wned, pwned, 0wn3d, pwn3d, own3d. Except your decimation has come at a complete surprise. For instance, being one-shotted from an enemy in hiding. Or turning the corner and running into 12 of your enemies. They all blast at the same time and you instantly drop. Also, a Raid Boss kill can be WTF Truck.
I was grinding away just about to level when I got wtf truck by a pos kos rival.