A phrase said prior to any ridiculous statement to give the illusion of validity.
"Now, I don't have the facts to back this up, but I believe Herman Cain was born in Indonesia."
by Notwhoyouthinkitis October 07, 2011
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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 03, 2012
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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 friend who isn't really part of the group, but who you hang out with when the rest of the group is gone.
Why isn't Kailyn paying any attention to Meggie?

Oh, Meggie's just her back-up friend. She's talking to Ashley right now.
by Sleet October 22, 2009
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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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