After eating copious amounts of Taco Bell/Mexican food and having to shit extremely bad, right as your ass comes in contact with the toilet seat the shit flies out, nearly missing the bathroom floor.

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