When you have eaten something dodgy or drank too much and your shits turn into liquid. When you go to relieve yourself, your sphincter only opens a tiny amount before the liquid shit starts to squirt out in a narrow beam - This is a 'laser shit'.

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