A shandu is slang for a jackoff indian customer looking to buy a car. They come in, testdrive, ask
you a fucking million questions and then leave without buying 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