ff
heres all the definitions for FF:

freindly fire
Fire fight
Flying fuck
Flaming Fist
Frostfire
fortissimo
focus fire
Front Wheel Drive
Forum faggot
Freedom Fries
finds funny
False Friend
Fake fuck
Foot Fucker
Fucking Fool
Fan Fiction
Final Fantasy
Front flip
fun fuck
Fucking freak
Father fucker
Fist fucking
Fat Fuck
Freshly fucked
Fatal Fury
Final Fight
Front Engine

Bob: FF!
Joe: False Friend?
bob: no
Joe: Fire fight?
bob: NO
joe: Forum faggot?
Bob: No, noob
Joe: Front flip?
Bob: wait it was the second one...