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.
Bob: "I don't think I have Todd, only TBS, what is ITBS?"
Todd: ITBS: Itchy Tight Bum Syndrome, when your ass cheeks are in the position of TBS, but then get extremely itchy all of a sudden. I just can't seem to scratch it properly."
Bob:"Do you need a butt scratcher?"