NHL Star Tyler Seguin -- Uses Penis as a Golf Tee

File Under: "Nuts" ... because NHL superstar Tyler Seguin let a pro golfer tee off ... FROM HIS MAN JUNK ... and the whole thing was caught on video.

Tyler agreed to the stunt to promote the TFP Charity Golf Classic -- hosted by the Dallas Stars player.

Seguin claims the man who smacked the ball off his genitals was a pro ... but still ... to let anyone swing a club that close to your wang ... wow.

He's not the first person to use his body as a tee ... earlier this year, John Daly smacked a ball out a woman's mouth.

And a few years ago a model let a Playboy radio host tee off from her butt crack.

The butt stunt didn't go as well ... and the model sued for damages to her ass.

Fortunately for Seguin, his penis seemed to emerge from the stunt unscathed.