A person (mainly a boy) who is usually seen chatting up girls (or boys) at parties. They may have numerous girls (or boys) around him/her. The term comes from the term "pull" meaning to attract someone to a point where they start to have casual sex.

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