brain glitch Share definition Flag A temporary spacing out, or lapse in judgement where one makes an error in thought or analysis. He answered much more difficult trivia questions, but when asked the answer to 9 squared, he had a brain glitch. brain glitch by Raoul_16 July 21, 2008 0 0 Get merch Get the brain glitch mug. Buy Now — $32.95 See more merch