Negative Action is the phenomenon where your own imagination betrays you and your fantasies turn into getting shot down by your imaginary hotties. It makes masturbation really hard - no pun intended. It's considered much worse than no action.

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