sack tap Share definition Flag A trick played on a fellow athlete where the open hand smacks the target's testicles with the knuckles in a sharp, wrist flicking motion. "Dude, I sack tapped Brandon, and now he has the whole team trying to sack tap me" sack tap by Chris M July 7, 2004 Word of the Day on October 30, 2020 Words you can keep railfan mug chonk mug chud mug based mug 67 mug slime mug mogging mug chopped mug thot mug glazing mug huzz mug yams mug larp mug unc mug cracked mug simp mug baddie mug bop mug lolcow mug