To insert ones spit lubed middle and index finger into both nasal passageways of an unsuspecting bistander.
“That was such a good mayonnaise pocket, I got more booger on my finger than he got spit in his nose!”
by Gabitron2000 November 23, 2017

When you pull out during sex and cum on someone's back without telling them so they lay down and smear semen on their sheets.
Did you hear about Drew's girlfriend dumping him? Yeah man, he gave her a mayonnaise backpack and she ruined her sheets. 1,500 thread count, bruh. That's not cheap!
by Neo-Neo Zeon July 1, 2020

by B.allen December 9, 2021

by Trenton Jump69 June 12, 2018

by Not ur dad but doin ur mom September 30, 2013

The act of a man and woman having sex after a different man has already ejaculated in said woman and man #2's penis is covered in the ejaculate of man #1 upon pulling out.
"I hooked up with Billy in the closet during the party only to bump into Steve right after. He had no idea so when we hooked up I totally gave him a Mayonnaise Popsicle."
by HandyAndy33 July 27, 2019

when someone nuts in a jar until it's full then shoves it in his ass and has someone fuck him until it shatters inside him.
by Quandale Dingle January 15, 2022
