When a man ejaculates down a girl's crack, only to have himself or another individual lick it off and spit it back down another person's crack, only to have it licked off again, thus being "snowballed". Repeat as necessary or often as desired. A variation of the popular snowball.

A jack off buddy (from 'cum' /'come', meaning 'semen', and 'companion'); a friend that you get together with for sessions of solo or mutual masturbation
Variant of: cumpanion (from 'companion' & 'cum'); jack off buddy & wank bud & JO buddy
Similar to: fuck buddy