French Goodbye 

To leave a party or a large gathering without saying goodbye to anyone.

"If I would have said good night to everyone at the wedding last night it would have taken me 2 hours, so I just did a French Goodbye."

French Goodbye by Mike D. KMFD August 9, 2009

French goodbye 

Leaving a sexual partner with a bruised left butt cheek, a red right butt cheek, and cum sprayed inbetween, in a manner resembling the French tricolour flag.

Friend: How was yesterday night?
You: Amazing. Michael was great, he left me with a French goodbye which was so hot!
Friend: Ew.

French goodbye by CarlVonClausewitz April 23, 2023

French goodbye 

Ending a romantic engagement by making a casual exit, and then never returning. A ruse, to make leaving easier.

It was a wonderful summer, but I knew she wasn't the one. I told her that I needed to go to the store, but I could tell she knew it was a French goodbye.

French goodbye by Erich 8 May 14, 2017