Onion Sandwich 

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.

Bro 1: Man, I had an onion sandwich today.

Bro 2: Yeah I can smell you from here. Tell Monica to wash her snatch.

Onion Sandwich by Mega Hemroids August 16, 2019

onion sandwich 

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.

why isn't josh in school today? he was too busy making an onion sandwich.

onion sandwich by Rhyda Broomstik September 23, 2009