Spilling the beans on the cat's pyjamas Share definition Flag To ejaculate on the pubic hair of your lady friend, perhaps as a form of safe sex. "We didn't have a condom so I ended up spilling the beans on the cat's pyjamas" Spilling the beans on the cat's pyjamas by gruntyphish September 25, 2009 0 0 Get merch Get the Spilling the beans on the cat's pyjamas mug. Buy Now — $32.95 See more merch