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2.
To leave early without saying goodbye and not paying their share of the bill.
Where did they go, the tab just arrived.

The fuckers did a french exit...
by mv74 March 14, 2009
 
1.
To make an early exit without saying good-bye
Cinderella made a French exit from the ball.
by Gabriella January 08, 2005
 
3.
Leaving the scene of a sexual encounter before one's partner has had a chance to clean up. (specifically/crudely: while things are still dribbling out of things)
He was a total asshole. Pumped me full of seed and pulled a French exit quicker than you could say 'je ne sais quois.'
by Approbate April 14, 2011