The Light Up Share definition Flag A sex move where you jizz in a girl's eyes and then smack her in the face with a lamp. "I gave this chick The Light Up last night, man. It was going well until the lamp broke in her face." The Light Up by GM Sexay May 5, 2010 0 0 Get merch Get the The Light Up mug. Buy Now — $32.95 See more merch