nag it up Share definition Flag An expression that can be used in absolutely any situation. The "nag" part is a nicer way of saying nigger. (Drinking coffee) Ian: Let's nag it up in your car Jesse: WTF. Don't say nag it up nag it up by gangstitup March 16, 2009 0 0 Get merch Get the nag it up mug. Buy Now — $32.95 See more merch