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
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That teacher, he be backed-up.
by Strongboy July 13, 2008
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This is basically someone that you know will say go with you to prom if you ask them. This has to be a person that you can relatively stand for a full night, or else can stand to stand next while taking pictures and then ditch him/her for the rest of the night and hang out with that person that you actually wanted to come with. This has to be a person that you know no one else will want to ask, so they are definately available.
Steve is my back-up, back-up prom date, so I know that I am guaranteed to be going with someone.
by carolinimartini February 19, 2006
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Haplessly taken for granted just because it’s not “exciting enough” or it’s “too good”. A plan that will only be referred to when all else fails. When you become a back up plan you should
figure out a way to hit them hard with the realization that you won’t always be there for them to walk all over you when they have no one else to go to; that you’ve got your own plans too. Otherwise, you my friend, will forever remain stuck in that phase.
Checkout doormat
Person #1 : Hey bro so what’s our plans tonight?
Person #2 : Who said “we” had plans? Check back with me in an hour or two.
Person #1 : What, so now I’m a back up plan?
by lufituaed.bnim November 27, 2017
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A girl who you will become your wife if the two of you are single at a pre-determined age.
Robin: Let's make a pact, if we both turn 40 and we're both single..
Ted: Robin Scherbatsky, will you be my Back-Up Wife?
Robin: A girl always dreams of hearing those words. Yes, yes, a million times, yes!
by drewdaspot March 4, 2012
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The next person in line that you ask to do something with after your preferred person isn't able to.
guy 1: "My girlfriend can't make it for lunch with me today...do you want to go?"
guy 2: "What, am I your back-up bitch?"
by RNPS August 29, 2007
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