9.5 cake eater Share definition Flag n. a girl who recieves a 9.5 on the hotness scale until she enters a dorm of drunken guys, says nothing, eats cake, and leaves OMG did you see the 9.5 cake eater? Hey Matt, there's your 9.5 cake eater. 9.5 cake eater by udcakeeater June 10, 2011 Get the 9.5 cake eater mug.