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TBS: Tight Bum Syndrome: the action at which some one, who is nervous, clenches their butt cheeks in anticipation of a specific anxiety/nerve inducing event. -Walking is sometimes difficult, although it does make your ass look out of this world. ITBS: Itchy Tight Bum Syndrome: The occasional time during TBS: Tight Bum Syndrome, when your ass gets extremely. annoyingly itchy. Usually an itch that just doesn't feel right scratching on your own, so you must employ a friend to do it immediately. Or some kind of utensil.
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