jit brain Share definition Flag Compaction of idiot and brain, id'jit, encompassing an unjustified, prevalent dark side which is dangerous to all living things due to mental deficiency. George W. Bush, Dick Cheney, et all. are jit brains. U. S. government post Eisenhower. jit brain by kent3208 August 20, 2009 0 0 Get merch Get the jit brain mug. Buy Now — $32.95 See more merch