excess cum stored in the balls because you haven't shot your load in a few days
I need sex now, I've got backup
by Freaky Deaky October 30, 2005
A bitch move when you don't have the balls for the task at hand. Call for help because you can't bring it to the table.
What a lazy bitch! She needs backup because she can't hang with the big dogs.
by DoctorFeelgood April 28, 2009
When you drive your car in reverse, you back up.
That moron scratched his car when he backed it up.
You should use both side and rear mirrors when you back up your car.
by BMatty November 26, 2010
There are 2 common meanings:

1/Used in military or police force: Reinforcements, support, help.

2/Computer using: create your secured data in case the computer goes down suddenly, mainly to prevent data loss.
1/Police officer shouts via radio: "Shot fired, shot fired. Officer down. Unit 26 to base, we got a situation here. We need back up immediately!" - "Roger, just hold on. Back up are on the way."

2/Before installing Smart Windows Care, we strongly recommend you to back up you data first to prevent yourself from losing important data.
by Mr. Bum Bum November 13, 2010
1. your systems second source of energy if the first ceases to produce
2. what to say when someone is being too forward
3. the thing cars do when they just ran over a curb
1. Just use the backup.
2. Back Up!
3. Shit! Back up.
by toy October 06, 2003
When a girl or guy breakup the other gets invovled into another relationship right away. Usualy within 2 weeks after the break up. The other person they are invoved with is known as the "backup". Look out for someone they have never introduce you too but yet they always have contact with. They will just say it is only a friend. But the "backup" is the person they go too if your relationship falls through
Within a week of us breaking up she had another boyfriend.
She had backup and i had nothing.
by Kula4u May 05, 2011
A dancefloor technique to attract the attention of a partner. Essentially this involes backing your bootie towards your partner and getting close, often thrusting. This technique will initiate a grind type of dancing.
She's backing-up to you dog! Get in

Let's get on the dancefloor dog. We can back-up on those hotties over there
by Dykester January 15, 2007
The act of transferring your 40gb porn collection to removable media in event of hard drive failure
Shit, I haven't made a backup for a month!
by fusion October 05, 2003

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