A phrase used when a small to medium sized girl with blonde hair and a heart shaped booty " pops locks and drops it" infront of you in a very flirtacious manor by "dipping it low" and pushing her ass into you on the way up, in hopes of getting your attention.
Guy 1: " Dude i was just here minding my own buisness and suddenly she came out of no where and tried to "back up on it" against my leg!

Guy 2: " All she wanted was for you to say something about her ass, she feeds on attention."

Guy 1: "Well i tried yelling "Back off Bitch", but it didn't seem to work, i will just be ready for next time."
by AvengerMan September 30, 2009

5 Words Related to Back Up On It

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