The back side of an estate: the backyard and outbuildings behind a main house, especially (UK dialect, euphemistic) an outhouse. / (euphemistic) A person's buttocks.

(board sports) Approaching an obstacle backward / Used other than figuratively or idiomatically: see back, side.

plural of backside

(baseball) The rotation of the knee and lower body of the side of the batter away from the pitcher during a swing.

(euphemistic) Synonym of pain in the ass.

Alternative form of kick up the arse

plural of kick up the backside

Alternative form of think the sun shines out of someone's arse