Fellatio (blow job for all you people who dont know lol): so called the Essex Kiss because it is the trademark of the Essex Girl. Usually perfomed by a drunk or plain sluttish Essex girl on any old random she meets in jacs.

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