sack-tap Share definition Flag A sack-tap is a light tap (it hurts tho!) that a fellow soccer player may do to another player, where a dude raps the sac-de-noix of another guy. I sack-tapped Matt, and now he's got everyone trying to sack-rap me! sack-tap by USAF Cadet January 30, 2021 Get the sack-tap mug.