The tube like section of the body in which fecal matter exits. Your anus.

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 poop tube is when you put your hand in a tube like shape and put it over someone's mouth and take a big meaty shit and stuff it in their mouth with one finger.

A sexual device created by Bill Cosby in 1975. The tube is to be lubed up then inserted inside both partners anuses. One partner then leans him or herself on something and proceeds to shit in the other persons ass when the shit goes down the tube. The partner who recieved the shit then gets on top of there partner and shits there partners shit on their own chest, face, or mouth. The device has remained popular in scat porn circles and an electric poop tube is forthcoming.

The area where you sheizen out of in place of a anal substitute.