A sexual act in which the man inserts his erect cock into a woman while they are both stood facing each other. The man then proceeds to spin the woman around in a full 360 degrees motion, giving the appearance of a plane propeller spinning around its prop shaft.

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