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 31, 2007
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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 23, 2009
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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 30, 2007
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There are usually "back-up channels" in which to people use in times when all other channels are on adverts. This saves people from being bored and changing activity to going outside or reading.
Dude - "I'm so glad we have this back-up channel.. i mean police camera action is pretty boring but i'm glad we're not watching some shitty adverts.
Dude-et - "yeah the adverts these days are just all for freakin injury lawyers.."
by Jonny Clarke July 5, 2009
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Keeping a person on the side as an alternative if original plan falls through.
If all else fails I've got so and so as a back-up plan, you know as a last resort.
by Mister please March 13, 2018
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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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