What the butt

A PG-rated version of WTF, or what the fuck, which can be abbreviated in a similar fashion as: "WTB." NOTE: "what the butt" / WTB carries an alternate definition by the simple insertion of a comma, as in: "What, the butt?!" Or, "What, the booty?!" The initialized version is universally accepted as a code phrase to express, "Are you signaling me to look at that stranger's rear end?"