An outgoing person who can be fun but really annoying at times. Tends to hit you when at a young age. Makes bad jokes that annoy the hell out of you. But in the end you still love them.

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