The movie with the most f-word used to this time is the movie "F###" from 2005 which contains the word 629 times, but it doesnt really count as its a documentary.
Then there is 'Nil by Mouth' from 1997 (a Gary Oldman movie) which contains the word 470 times so atm that one is the record holder
'Scarface' "only" has 218 uses of it
and surpassed by 'Born on the 4th of July' (289) and 'Casino '(422).
Gotta love facts
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2001-2006 (Retired)
"Definitions belong to the definers, not the defined" - Toni Morrison