A tube that is shoved up someone's ass. Liquids are then able to be passed through the tube into the person's anal cavity therefore giving them special sensations.
I shoved that asstube into Alby's ass and then I filled his ass with piss and rocketsauce.
the lower part of the digestive track adjacent the anus; the rectum
If you have rough anal sex then you may end up with a sore asstube for a while.
Word used to describe an asshole
when specifically suggesting that the person is the tube-like, shit-covered skin within the anus, rather than the air between it.
That guy just stole my seat! What an ass tube!