G-Unip Share definition Flag (N.) The substance responsible for making people act like 50 Cent. When someone says, 'I'll bust a cap in the nigg-gah!', they are on that G-Unip, again. G-Unip by G-Union May 19, 2003 0 0 Get merch Get the G-Unip mug. Buy Now — $32.95 See more merch