45 it Share definition Flag Pull out of a curbed driveway with a 45 degree angle so as to not hit the front bumper on the sidewalk. Dude! You'd better 45 it or else your bumper's gonna get some major pwnage. 45 it by that cool guy who knows everything September 6, 2007 0 0 Get merch Get the 45 it mug. Buy Now — $32.95 See more merch