When a man goes up behind another person who is crouching down, and puts his hands up in the air wrists bent down at 90 degree angles, hands in the shape of claws. Often done to unsuspecting people. Based of an awkward photo which depicts the Marvel character Sabretooth coming up behind a kneeling Wolverine in this fashion, with the caption Release your inner animal. Mocked for its homosexual undertones, which the creator openly denies.
Dave-"Dude did you just see what Chris did to Kyle."
Matt-" Yeah man he totally just sabretoothed him."