When a female/male is riding their partners face, and on orgasm they defecate on their partner's forehead and flatten it with their ass cheeks.
Marry was riding my face so hard and gave me the largest Michigan Flat Tire that I'm still trying to wash it out of my bangs.
by Delaware Seagull Shake May 17, 2022

by TugglesB June 10, 2018

by ArfGraf May 25, 2016

When you use ranch as lube for anal sex and when he pulls out his penis, and the ranch follows and lands flat on the floor.
by Whatwhatchickenturd May 7, 2024

by donniedarkofan69sex November 2, 2020

when we got home last night, i was so ready to throw him down and hop on top but no such luck--he had a mccurry Alaskan flat tire :( waaaaah..
by DixxieCallahan October 6, 2016
