Rob Reiner -- It Was an Honor ... Dropping Wolf of Wall Street F-Bombs

Critics are bashing "The Wolf of Wall Street" for its excessive use of the F-word ... but one of the movie's stars says it was a career highlight.

Rob Reiner -- who plays Jordan Belfort's dad -- told us he's aware audiences hear the word way more than in most films (506 times) ... but if Martin Scorsese wants it that way, well Rob is a happy soldier.