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
by Exless November 03, 2020
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To Bang, Fuck or have intercourse between two people!!
Did you here that Phil picked up that chick at the club then took her back to his place and Tossed Her Back
by Shoe Guy 7 January 07, 2011
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the cult chants this in my livingroom while i bleed out on the floor
Cultists "to the left, take it back now yall, one hop this time"
Me *bleeding on the floor after being stabbed 80 times*
by squiggatron April 22, 2020
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