Frosty Bob is the act of taking a woman's vagina and shoving your tootsie roll the whole way in and hump like a dog on your leg. Then when her vagina is like mashed potatos two weeks after christmas, you pull your pants up and run out of there like a mexican crossing the border.

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