Someone who repeatedly tries to cover up their boner by tucking it into the waistband of their pants.
Girl: "Where's your boner??"
Guy: "Call me the waistband bandit."
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When a girl is giving you a blowjob (head) while intoxicated, she wraps her arms around your waist causing extreme deepthroating.
i.e. I was at this party a couple nights ago and this girl gave me an Irish Waistband and it felt so right.
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When playing beer-pong and one player rubs the ball on their nutsack before sinking their shot the beer in that cup becomes waistband coco
John is so trash at pong, we had him chugging waistband coco