To jerk off without the usage of material, such as a magazine or video.

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

If you think of the skateboarding move "stalefish" where you reach behind your legs, and grab your board this manouver is adapted into masturbation.

This is the action of jerking off, then jerking off right after that.