Someone who jumps to the front of the line at a fast food restaurant counter to get their drink refilled before the person they have cut has a chance to place an order.

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