When you take a towel and hold on to each end. Putting the towel in between your legs and moving it to the front and back (like you are flossing your teeth, but instead its your balls/crotch)

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

Using the owners towel to wipe your ass after taking a shit or sharting in the motel lobby. This is a nice follow-up to the classic Curtain Floss. Towel Floss is also handy when you drop a Tub Turd.