The excess buttcheek that spills out of the bottom of really short shorts. Also known as the eighth wonder of the world.
Nellie was attracted like a moth to light to the bodacious Under-Cheek created by Ari's impractically short shorts as the bedonkadonk jiggled up the spiral staircase.
by RelDeEnningandNelephant June 18, 2018
Get the Under-Cheekmug.