french back 

when your back becomes so unpleasantly painful from doing too much online french in the morning.

bro, i did so much french this morning that i now have french back. i have to sit up straight god DAMN.

french back by kkuso July 7, 2019

Back Door French Kiss 

A Back Door French Kiss is when one person places their own anus against someone else's anus and then proceeds to defecate into the other's anus.

Me and my girl did some back door french kissing last night!

Back Door French Kiss by Scunt_McGravy September 28, 2018

french backwash 

When you cum in the chicks mouth then slap her across the face with your wallet.

Kari- My mouth still hurts from yesterday.
Mrs. Stratton- What hapened?
Kari- Al gave me some french backwash after i gargled his marbles.

french backwash by Dusty Cox July 21, 2009

French Backdoors 

Simlar to the French Kiss. (A kiss with a tongue), but instead of oral, you use anal activity.

Dude have a mint, your breath smells...

I Gave your mom French Backdoors last night, thats why my breath is not fresh anymore.

French Backdoors by Uncle_Gabsie January 6, 2022