put the slipper in Share definition Flag (British) Varient of put the boot in, eg. kicking somebody when they're down. When it became obvious he would be fired, the whole office took the chance to put the slipper in. put the slipper in by asdf April 16, 2005 0 0 Get merch Get the put the slipper in mug. Buy Now — $32.95 See more merch