When you slap your meat on a bald person head with windex while saying your a lemon. you may also do this while doing your math homework with a spicy twist, you have cum all over your face and you must write blindly

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