A homonym of the popular American Idol star, this phrase describes the act of tucking one's boner into one's waistband to hide an erection. This was described in the popular movie Superbad, when Jonah Hill's character, Seth, remarks, "I flip my boner up into my waistband. It hinds it AND it feels awesome. I almost blew a load into my bellybutton."
This elastic waistband helps me carry underwood around hot chicks without looking creepy.