In a group of poker players, the shuffle bitch is the player who goes bust first. He or she cannot go home for the rest of the night; instead they must remain and shuffle cards for everyone else at the table.

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