to back 

To back can be just defined as to support.
But it can also be slang for pulling out some kind of weaponery like a knife,

this is mostly used by people in Gangs or people involved in the streets.

Examples of to back:
Worker: My chef really backed my proposal for a new toilet.
Rapper: Hella chitter chatter if I back it you be dartin' of ...
Lyric of SL - Gentleman

to back by Exless November 3, 2020

Sack to Back or Sac to Back 

Sack to back is the term used when two males ride a motorcycle or scooter together.
Also referred to as "Butts to Nuts"

Those guys are riding "Sack to Back or Sac to Back"

Sack to Back or Sac to Back by Indetrucks March 4, 2011

Quick to back down

1. When one tends to speak profusely and institute name calling to another, only to retract previous statements when faced with physical opposition.

Adam was talkin mad shit but he was quick to back down when I tried him. I'll run up on him all day wit an AK.

Adam was bein a bitch so I split him in his face. He ran away, he was always the quickest to back down.

Quick to back down by Ardvark May 26, 2005

I don't have the facts to back this up 

A phrase said prior to any ridiculous statement to give the illusion of validity.

"Now, I don't have the facts to back this up, but I believe Herman Cain was born in Indonesia."

I don't have the facts to back this up by Notwhoyouthinkitis October 9, 2011

Back to Back Racks 

When an individual sees two ladies in a row with great racks. Usually occurs in a public setting, such as a sporting event.

Just saw back to back racks while heading to the snack bar.

Back to Back Racks by triz18 September 6, 2011

back to back

consecutive - one after the other - successive

I had three meetings back to back

back to back by Aaadrian July 17, 2006

Back To Back, Salem! 

An expression of teamwork, used when there are two people on a team, in any kind of event, against two or more people. Comes from the Xbox 360 game Army Of Two, where there are certain "Back To Back" sequences. During these sequences, the two characters go back to back and start shooting, in order to easily dispatch their enemies, who are usually terrorists. When this happens, sometimes one of the characters, Tyson Rios, shouts "Back To Back, Salem!", Salem being the last name of the other character. This term can be used anytime to imply teamwork.

During a paintball match, everyone except me and Payden were out. I heard him shout "Back To Back, Salem!", and we met up and continued to win the game against 4 other opponents.

Back To Back, Salem! by Shaolin Masta January 30, 2009