What one often does after a breakup -- usu. the end of a longterm, monogamous relationship -- which involves promiscuous sex and/or sex play with a variety of partners. Sometimes accompanied by malicious intent.

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

V. the act of being promiscuous.