oral sex, especially on a man US, 1916.

an open-mouthed, French kiss US, 1978.

profanity US, 1865.► excuse my French!; pardon my French!employed as an apology for a use of spoken language which may cause offence. Often used in a cursory manner or with insincerity. The original intention, presumably, was to allow the apologee the pretence not to have understood a 'foreign' word; now the apology is a cliché which merely acknowledges an inappropriate use of robust unconventional English UK, 1936

to perform oral sex. The term derives from the widely held belief that the practice is very common in France US, 1923.

to French kiss; to kiss with open lips and exploratory tongues US, 1955.

in drag racing and hot rodding, to fit the bonnet (hood) over the headlights to create the apperance of recessed headlights US, 1968