Smeg for Brains Share definition Flag From the sci-fi comedy Red Dwarf. Someone very stupid. A form of shit for brains. An insult. "Hey, smeg for brains- get us another beer." Smeg for Brains by Radclyffe November 8, 2003 0 0 Get merch Get the Smeg for Brains mug. Buy Now — $32.95 See more merch