The act of hairy men/adolescent males piling up on top of each other and grunting, usually on top of some type of real or imagined "ball". It is enjoyed mainly on school ovals in many cultures.

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