back-up friend

an acquaintance that is only spoken to when all of one's real friends are absent.

A: Why were you talking to Erik that other day?
B: Dude, he's just a back-up friend. nobody else was around worth talking to.

by assgoblin82 February 3, 2007

Back-up Friend

A friend who isn't really part of the group, but who you hang out with when the rest of the group is gone.

Why isn't Kailyn paying any attention to Meggie?

Oh, Meggie's just her back-up friend. She's talking to Ashley right now.

by Sleet October 22, 2009

back the fuck up

a hostile directive to retreat; usually to feign an attempt to prevent an altercation.

Nigga, You had best to back the fuck up offa me fo I beat yo bitch-ass!

by spence-doggy-ddog February 11, 2006

back-up bitch

Person you invite to go somewhere when your preferred person cannot go. Can be male or female (non-gender specific).

"You can't make it? I better call my back-up bitch!"

by Rob Norment December 15, 2008

Back that butt up

an attractive luscious female ass

"woohoo hey baby back that butt up!"

by theCARS7879 July 13, 2018

back that ass up

when a girl puts that delightful arch in her back, and sticks her ass out in a erotic/sexually suggestive manor, often accompanied by a "booty dance", that brings shear delight to the males species.

"did you see her back that ass up, playboy? it almost brought a tear to me eye, and a 2x4 to my pants!"

"did you see lucy liu bending over in the drive-thru scene in charlies angels?? ddaaaaaaaaamn, it was delightful! that the essence of female perfection!"

by deluks December 28, 2005

Back-up plan

Keeping a person on the side as an alternative if original plan falls through.

If all else fails I've got so and so as a back-up plan, you know as a last resort.

by Mister please May 10, 2018