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.
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.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the USCoast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."