(v.) To use a new example of machinery at a low pace to allow the parts to wear into each other.

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

When a woman spreads her legs and a man runs in.

Occurs when one or more individuals who are not actively participating in a match run into the ring.