kick up the arse/backside (redirected from kick up the backside)

a kick up the arse/backside (British & Australian, very informal)

if you give someone a kick up the backside, you do or say something to try to stop them being lazy. He does nothing but watch TV all day. His mother should give him a kick up the backside. The threat of losing my job was the kick in the pants I needed.

See also: arse, backside, kick