Abbreviation for Oh My God Happy Birthday. Implemented by overly-excited teenyboppers on social networking sites. Variations include but are not limited to OMFGHB (Oh My F***in' God Happy Birthday), HCHB (Holy Crap Happy Birthday), HSHB (Holy S*** Happy Birthday), etc.

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