Coming home from any vacation and keep on getting circular or very round bullets of shit until you have this massive motherload of a fuck come out and you have the squirts for the rest of the time. Most common in Disney Locations due to the massive sorts of food and re-used crap in the food and water.
Mom: Hows my baby timmy...
Coroner: He died from Disney Back-Up
Mom: ....
by MaZe000 March 29, 2008
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an acquaintance that is only spoken to when all of one's real friends are absent.
A: Why were you talking to Erik that other day?
B: Dude, he's just a back-up friend. nobody else was around worth talking to.
by assgoblin82 January 30, 2007
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a hostile directive to retreat; usually to feign an attempt to prevent an altercation.
Nigga, You had best to back the fuck up offa me fo I beat yo bitch-ass!
by spence-doggy-ddog February 01, 2006
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Person you invite to go somewhere when your preferred person cannot go. Can be male or female (non-gender specific).
"You can't make it? I better call my back-up bitch!"
by Rob Norment March 29, 2007
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Your shoes that you keep in your locker at school just in the case of you having to poop in the stall and you don't want people to know its you by the look of your shoes .
I took a shit at school today, good thing I had my Back-up Shoes in my locker.
by Gimaf June 14, 2012
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in reference to being told something unbelievable or shocking, means to hold on and go back to what was just said; request to repeat and readdress a comment.
"Whoa. Back up the bus - what did you just say?"

"Hang on - back up the bus. You were doing WHAT last night?!"
by mypseudonym2012 September 26, 2011
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