Somebody or anybody who drops out on one person. Say like you got this friend and you thought they would be there for you but they weren't because they were/are acting shady.
"Damn she so shady, what a fallback.
by craftynineo4 March 24, 2008
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this means stand back or get slapped or punched causing you to literally fall back
fallback or fallback ya dig man, cuz i really dont wanna get violent in this motherf@&$er
by man of the year October 14, 2006
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Fallback or Fall Back:

1. Phrase used to command someone to back up or cool down
2. Get Real
1. Phrase used to command someone to back up or cool down

Ignorant Person: A dawg you was that nigga that was talking to my ex at the party. So you gon' disrespect me and talk to her, knowing she was my ex?

Person 2: Mane you getting real hype for nuttin'. Get out my face with that s#@t

Ignorant Person: Naw mane, I hate n!ggas that try to disrespect me!!!

Person 2: N!gga FALLBACK d@mn it ain't worth it!

2. Get Real

Corny dude: A baby, you know you wanna talk to me.

Fine Chick: (ha ha) N!gga FALLBACK!
by IL Soul December 2, 2005
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The friend that your other friends don't know, who you go to when the shit hits the fan.
Jack:I'm tired of all the drama,I'm gonna hang with Chris.
Bob:Who?
Jack:Exactly.

"Dude, Where were you last weekend?"
"I was at my fallback friend's place all weekend, so I could avoid the shit thats been happening."
"Good plan."
by The New Man April 21, 2008
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The "friend" you go to when you have no one else to hang out with, whom you would never talk to otherwise.
Michelle: "Well, Kayla just ditched me and I don't want to stand here like an idiot. I guess I'll go talk to Janice, my fallback friend."
by FOSHOYO May 20, 2008
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Fallback sex is the kind of sex you can easily negotiate to in lieu of intercourse. Generally its manual or oral or a combination of the two.
i always know that Keith will be fine with a good hand job and a moment or two of oral sex..so i like to stay on top of my fallback sex techniques...its not as messy..
by DaynaS February 19, 2008
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a girl that a guy will always go back to after he is done with his current infatuation. she gets labeled the fallback chick cause she will most likely take him back every time. she may or may not be aware that she is his fallback. she may think she's his main girl while he does his dirt behind her back. or he keeps her around so when females find out he's a dog he will still always have that one chick to show him love.
Guy1: What's good with shorty?

Guy2: She was iight, i'm chill'n with her later but if she don't give it up i'm calling 'Tasha'.

Guy1: Damn, she been taking your ass back for a long ass minute.

Guy2: She my fallback chick dog, she'll always pick up that call for me.
by UrbanShortyRoc July 12, 2009
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