Someone who, in a picture generally, has teeth that blend with their braces to give the effect that they have Oreo Sludge (milky oreo crumbs) all over their teeth.

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

When he’s eating out your ass and you empty your rectum into his mouth. Giving him the appearance of Oreo stuck in his teeth.