Checking out a chicks ass, specifically while on an escalator or similar situation (so you are 'following' it). Also, can include the act of positioning yourself just behind a chick on the escalator (following close).
Johnny was tailgazing all the way up the escalator at Wheaton, did you see the chick standing in front of him?
by Lacoste - DC Metro Tailgazer April 23, 2009