Twat Knocker Share definition Flag someone who is incredibly annoying or is just terrible at doing simple things such as everyday tasks. Guy 1 "How do I-" Guy 2 "YOU JUST PUT IT IN THE MICROWAVE YOU TWAT KNOCKER!!!!" Twat Knocker by knockknockknock April 6, 2014 0 0 Get merch Get the Twat Knocker mug. Buy Now — $32.95 See more merch