When you a fucking someone from behind and you finish on on their back. They can't move because if they try they risk getting your babies all over them and the bed. So they are left frozen in the position you were fucking them in like you shot them with a tranquilizer dart.

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