The act of verbally one-upping a mutual friend, relative, or enemy.

You are a vupper when you cannot really one-up someone because you are too broke, so you verbally one-up by vupping.

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