Giants head coach Brian Daboll apparently has a bit of potty mouth -- and thanks to a hot mic on the field during NY's preseason game on Sunday night ... the world now knows it!
Daboll was caught dropping an F-bomb tirade following a pass interference call in the fourth quarter of the Giants' game against the Bengals.
The coach could be heard clear as day on the game's broadcast screaming, "That's f***ing bulls***! What the f***?"
Daboll, who's entering his first year as coach of the G-Men, appeared to be directing his anger toward an official -- but despite the passion, the Giants were still hit with the flag nonetheless.