that badum-CHING thing they do on a drum after a joke.

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

A "Rim Shot" is where you hit the drum head AND the hoop at the same instant. A "Rim Click" is where you hit the rim on its own.

A musical term. A stroke in drumming where the stick is whipped down hard on the rim of the snare drum to give a resounding smack.

When you cum on a drum

the badum-CHING of the drum set after a joke. Usually a cheesy joke.

A drum roll, usually heard after a corny joke, involving 3 three hits on the drum.