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f8 is short for "fate". F + 8 = Fate.
A snake slithers towards you and bites you in the ankle. The venom drops you to the ground in 5 seconds.

You could never scream because you don't feel any pain; the body just shuts down.

You have died of a mute f8. Sweet dreams in your permanent sleep!
by Java January 24, 2005
Bisexual. F8 being the shortened form of "faight", which combines the two words "straight" and "fag".
PJ is f8. He sucks his boyfriends cock and then goes home and bangs his girlfriend.
by Mike Kickass April 16, 2006