Definitions by DamienN

backjack 

The act of multiple men sodomising eachother in a human train. Just before ejaculating each one pulls out and blows their load all over the back of the guy in front shouting "twenty-one !"

Damien the sick fuck went out and played backjack with 5 guys he met at a gay bar.

backjack by DamienN July 14, 2006