Side Bum 

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.

Side Bum by RapidEyeMovementOfTheTiger January 26, 2011

bumb side 

An off-the-map location where friends gather to enjoy one anothers company, as well as participate in various activities.

Where's the bumb side at tonight? I'm trying to get me some...

bumb side by GoonSquadOG January 21, 2009

sidebum 

A term used when cleaning the toilet.

Did you clean that sidebum?

sidebum by Sidebottom May 18, 2008