Titty knackers Share definition Flag Irish slang, used to indicate a state of mentalness "Would you look at that?! You are off your titty knackers! Tink of the babbies!!!" Titty knackers by Paddy MacMahon January 10, 2009 0 0 Get merch Get the Titty knackers mug. Buy Now — $32.95 See more merch