Excepté une fois au châlet 

Expression popularisée par le vidéaste Antoine Daniel pour justifier ironiquement une faute d'une manière fort peu crédible. Elle provient de la vidéo d'un québecquois nonagénaire clamant qu'il n'a jamais violé ses filles, excepté une fois au châlet.
youtu.be/zJDoCPYybYY?t=9m5s

Je te jure que n'ai jamais éjaculé entre les orteils de ta soeur ! Bon... excepté une fois au châlet.

Excepté une fois au châlet by pussieseverywhere May 6, 2016

au contraire 

The snobbish French way to say "on the contrary", which is the snobbish English way to say "rather".

A: Au contraire, while an opinion cannot be wrong, that makes you no less of an imbécile.
B: Touché.

au contraire by Joshua Fan November 17, 2013

Au Review 

when a non-french person misspells "au revoir"

Nicole: im gonna go now
Damien: au review!
Nicole: lmao what

Au Review by spookytoad May 12, 2020

AU 

a Chinese internet fans group of the vitual youtuber group A-SOUL. AU is a homophone same to "A友", meaning literally "the friend who is an A-SOUL fan". Unlike the insulting name "A/" meaning literally "the stack who watches A-SOUL", it is a more friendly name to call them.

"Why does AU appear in this place?"

AU by JIAXINTANG[Infwww] July 5, 2022

au naturale 

misspelling of au naturel.

JSYK, it's not "au naturale", it's "au naturel".

au naturale by kadatz April 11, 2010

Cafe au Lait

In french, Cafe au Lait means, literally, coffee with milk. In the common American slang, the term refers to a person of mixed Black and White heritage.

Ahh, Janet, I see you're pregnant by Tyrone. A little cafe au lait on the way, n'est-ce pas?

Cafe au Lait by The Real Jack Jones February 8, 2007

au pair 

The word "Au Pair" is a French term, which means "on par" or "equal to", denoting living on an equal basis in a reciprocal, caring relationship between the host family and the children. An aupair will typically be a young woman and sometimes a young man from a foreign country who chooses to help look after the children of a host family and provide light housekeeping. The aupair is given room and board and is typically paid a weekly "pocket-money" salary. Aupairs generally stay with their host family for one year.

I spent a year in England as an au pair.

au pair by epical May 15, 2006