it happens when u r trying to put ur penis into ur gf's vagina, u miss but end up hitting the asshole which saves u from embarresment, works either way
person1: how'd it go wiv rebbeca then
person2: well i missed here vagina but luckily i found the back up hole
person1: u twat how do u get so lucky!!
by DJ SPYKERZ(SCOUSED OUT) July 31, 2009
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shes the type of girl thats ok with being second best. or in my eyes the first place loser.

she waits around until you a your bf broke and takes the sloppy seconds.

more than likely has brown hair, chubby, and brown eyes.


she usually still keeps talking to your bf when you dont now it, because shes trying to get with him.


if you have a sleeze of a bf then he'll probably cheat on you with her.

2/3 of the time its a past ex, who wants another go.
you better watch out, your boy has all the symptoms of having a back up girl.
by steffanay September 12, 2008
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used to say, "hold up" or "wait a minute" or "thats not true" or to express disbelief.
1. A loud girl, Joanna is talking to a boy, Liam for the first time:
Liam: you seem really quiet Joanna
Joanna: Back up the Train! I never shut up!

2. Joanna is talking to her friend Lisa later that day:
Joanna: so I talked to Liam today!
Lisa: BACK UP THE TRAIN YOU LUCKY DUCK!

3. Lisa is talking to Rebecca later
Lisa: Rebecca you're kinda annoy-
Rebecca: Backup the train & don't let that thought out of the station!
by ewitsmelala January 29, 2010
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You've had a massive night out on the piss and you're gonna do it all again tonight.
I know you got bat faced last night mate, but are you gonna back the truck up tonight?
by TommyTeaCosy July 30, 2009
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Some u date if u ur crush rejects u
Jonny is my back up boy
by Jdisjdided December 27, 2016
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when you take two different types of biscuit, one that's new and one that you know you like, just in case you don't like the new biscuit.
oooh i got some new biscuits, i'll have one to try, and a maryland cookie as a back up biscuit :D
by beffybop March 28, 2011
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Back up that money truck! — Financial windfall that occurs because of a random accidental situation; or, because of purposeful criminal activity. The exclamation “Back up that money truck!” is yelled the moment one gets a gander of the settlement check; or, the first pile of money made from successful illegal activity.
1) My car got rear ended by a city bus going up hill on a sunny day at high noon! LAWSUIT!!!!!! Back up that money truck!

2) All of those knock off designer bags got sold and no one got caught. Everyone came back with pockets so swole with money; their asses looked like they had THE MUMPS!!!!! Re-up on the gear!!!! And then, Back up that money truck!
by Mind Hunter the Profiler June 15, 2023
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