To be knocked unconscious, or in more extreme cases, killed by fruit, i.e. a coconut falling on your head or people throwing apples at you.
Derived from Mortal Kombat's 'FATALITY' finishes.
Jamal: Man, did you hear about Ken the other night?
Bill: No dog, what happened?
Jamal: Done gone hit on the head by a coconut, knocked him clean out!
Bill: K.O.! Fruitality!