Unfortunately Still Sleeps In Mother's Basement... a term used to describe people that argue over Star Wars themes, any form of inner galatic battle, or just total loser fucks that can't get any and sleep in their mother's house way into their late 20s and 30s.

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