A bad poker player who doesn't actually know how bad he is.

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

A girl with a fat booty.

a person who is being or acting like an idiot/ass

An Irish man or woman who just acts really fucking Irish.

You say it when someone says some dumbass shit

A term used to describe a girl with a fat ass