(noun) A really burly fat female, who you have to look at twice to see if she really is a man or a woman. Usually seen driving a truck, sporting a baseball cap and smelling like poo cheese.

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