A term used when cleaning the toilet.
Did you clean that sidebum?
by Sidebottom May 17, 2008
Similar to Side Boob, Side Bum is the visual conception of the bare waste of a woman(or if an unfortunate situation, a man), while the back and front of the waist is visually obstructed or concealed, yet still revealing the curvature of the buttocks.
(Person A): I don't understand why people fixate over the Princess Leia bikini, that cloth she's wearing over her waist covers everything!

(Person B): Except when she points her hips towards the camera and reveals some major side bum.
by RapidEyeMovementOfTheTiger January 25, 2011

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