A fallback boy is a term used for a boy who has lost all feelings for one of their exes, but then as soon as this ex starts feeling lost and helpless they message the "fallback boy" trying to kick things off again, and most of the time it works, it can be seen as one of the worst ways to be treated for a man as it plays with his emotions.
"Yo, Georgia's messaged me again, should i reply?"
"No! You don't want to be a fallback boy do you?"
by Fallback boy ;-; March 7, 2016
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When football players get in an argument and stop being acquaintances.

Usually occurs over a slut girl.
Guy A: Jim and Matt are having a fullback fallback over Jennifer.

Guy B: Jennifer? I fucked her behind the Mexican restaurant last week.
by dotVillain May 8, 2009
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A college or university that one applies to in case they are not accepted to the school of their primary interest.
A. You get into all the schools you wanted?
B. nah but I did get into my fallback school, SUNY Albany.
A. Well, at least you'll have somewhere to go; but your future doesn't look to great.
B. Yeah I know. That's what I get for being a tool in highschool.
by Steve "Tool" Rich January 28, 2008
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That one dirty skank at a party who everyone avoids during that party. However in drunken desperation and failure one may turn to for some "lovin". Likely if the fallback slut in indian he/she will still be avoided/shunned.
dude 1: Shit bro that Leanne chick is all over me help me get rid of her!
dude 2: Dude give it until the end of the night she's your fallback slut.
dude 1: Man are you kidding me?? That indians fucking nasty!! Not happening!!!
by partyparty37 May 21, 2009
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Food ate at the end of a night out when an individual has failed to pull. Usually a kebab.
"We didn't pull in there so we just got some fallback food on the way home"
by Hoose-of-Widnes April 11, 2009
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