Asstinence= Only doing it in the bum.
If teenagers are going to have sex, they should stick to asstinence because you probably won't get preggo in the pooper.
by kgetson December 21, 2010
When a girl will only have anal sex because it "doesn't count"
"That bitch Bernice is practicing asstinence so I gave her a donkey punch."
by DallasSallad May 08, 2015