A nerdy drunk girl who spends all week eating crappy shit while she spends hour paging through O chem, only to go out on the weekends and clog toilets at parties

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