What was the first mainstream Hollywood movie in which the word fuck
was used (and got past the censors).
According to Roger Ebert in his book Questions for the Movie Answer Man, it was Robert Altman’s M.A.S.H. in 1970.
FYI, a previous thread on the subject. Our conclusion there: MASH* is the first “official” usage, as far as big studio films are concerned, but previous instances can be traced back to the 1930’s.