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French scale (F),

a scale for grading sizes of sounds, tubes, and catheters as based on a diameter of 0.33 mm equaling 1 F on the scale (for example, 3 F = 1 mm); grading to scale is carried out using a metal plate with holes ranging from 0.33 mm to 1 cm in diameter.
Synonym(s): Charrière scale

French

adjective (slang) Referring to oral sex.

verb (slang)
(1) To perform oral sex on someone.
(2) To give an open-mouth (i.e., “French”) kiss.
References in periodicals archive ?
Fast-forward to today, Excuse My French proudly offers a collection of innovative and extremely comfy signature t-shirts, dreamt up in Paris and crafted in Los Angeles.
Ron Atkinson (above) Esther Rantzen (left) and Marcus Brigstocke (left, top) in the BBC's programme Excuse My French
Excuse My French is on BBC Two from Tuesday July 18.
The system is, excuse my French, screwed up, especially when you've warned them and you beg them to please keep him behind bars before you become a victim," Hall said Monday.
Excuse my French, but you guys are (bleeping) him up.
We're not having, excuse my French, people taking the pee out of us anymore.