Here's the grossest thing you'll see all day ... N.Y. Giants WR Sterling Shepard straight up pulled the nail off his big toe -- and documented it all on video.
The New York star hit the Giants locker room Monday ... and noticed his foot needed a little manicuring after beating the Buccaneers on Sunday.
So, Shepard reached down ... grabbed the nail on his left foot ... plucked it straight off -- AND DIDN'T EVEN FLINCH!!!
"Aw, yeah! It's time to come off! Yessir!"
Unclear when Shepard suffered the toe catastrophe that caused the gruesome scene .