The group of people who you hang out when your closer friends are busy.
So what are we doing?

Everyone's busy so we're chillin with the backup crew

That's cool
by Jak Majik October 17, 2009
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Activity used as entertainment if you main entertainment form is currently unavailable.
-Dude, what the fuck are you doing with a paddle ball if you got a PS3 right in the living room?!
-I'm grounded, this is my backup entertainment...

-Since we're staying outdoors this weekend, I'll have to resort to Uno cards as my backup entertainment.
by Xaphanon May 25, 2009
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It's a site that you have opened on a different tab, that you can go to in case your parent/guardian pops up and catches you on a website you're not supposed to on.
Friend 1: Dude, why do we need another tab open?
Friend 2: Its my backup site so I can quickly switch in case my mom walks in.
by harajukuluvr May 19, 2009
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Not using your primary girlfriend or boyfriend for having sex with. Using a ho or a pro when when you can't be with your main chick.
1: Looks like I have to rely on my backup sex this weekend.

2: Where is Rachel?

1: She's out of town all this week.
by AdmiralIII May 19, 2009
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1) An ethnic friend, generally female, who stands behind you and sasses your detractors whenever they are encoutnered.

2) Something generally heard over the loudspeakers at chatham high school. Nobody really knows what it means, but your life is never the same once you've heard it.
The sasi backup will begin in 5 minutes.

Oh yeah, that girl was getting all up in my face, but my sasi backup, Laura the Fexican, out sassed her hoe ass.
by Colin March 27, 2005
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Rapper or completely random black person appearing in a pop song in order to give white artists a false sense of street cred

"I be her backup black" - original lyric in Rebecca Black's "Friday" (seriously it fits right into that rap)
"Yeah (rapper X) is the backup black on that song"

See other Ark Music Factory creations - Alana Lee "Butterflies"

Justin Bieber "Baby" feat. Ludacris

Justin "I'm black on the inside" Timberlake "Chop Me Up" feat. Three 6 Mafia

Britney Spears "(I Got That) Boom Boom" feat. Yin Yang Twins

Christina Aguilera "Dirrty" feat. Redman

Big Time Rush "Boyfriend" feat. Snoop Dogg
by TrayDays April 30, 2011
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Two or more bitches in a group with a leader (usually a hotter chick).
If the hot chick wants to get in the face of a rival, she brings along her backup bitches cause she is too chicken shit to go solo.
by pmtm June 10, 2010
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