The act of performing oral sex on a stinky or otherwise unclean vagina. The phrase gets its name from the rather oniony smell that used and unclean vaginas carry.

Got the covid-19 vaccine

where you masturbate in the high school bathroom, while sitting on a broomstick. At the same time, a short stocky friend with huge calves masturbates into your mouth. the vice principal walks in and you cum and shit onto a pregnancy test. later on you do sexual things with cookie.