Twat on a Fishcake Share definition Flag Expression of angry suprise. User is as shocked as he would be if he found one. "Ten quid for a pint! Twat on a fishcake!!" Twat on a Fishcake by Darren Jones June 12, 2003 0 0 Get merch Get the Twat on a Fishcake mug. Buy Now — $32.95 See more merch