To have a deep, uncontrollable desire to something such as Gamble, Smoke, or Drink.
Man he has that Drinking monkey on his back, it is 9:30 in the morrning and he's already drunk.
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1. (Towards a woman) - As to say, get your clothes off and lie down on my bed because I'm going to fuck you.

2. (Towards a man) - As to say, I'm going to knock you the fuck out. Tripping the person and making them fall on their back to give them a warning of what's coming works too.
1. After you bring a girl back home with you, lead them to the bedroom and say "We're going to play a little game. It's called... Get On Your Back!"

2. As your about to get into a fight or during a fight (while on top of someone), yell into the persons face, "Get On Your Back" pussy boi!
by Scott Too Hot July 30, 2009
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When a flat girl arches her back to make her look like she got curves.
Why are you arching your back like that?
Oh I just need to make me look like I have boobs and a butt.
by Zarina o July 4, 2018
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To use a lot off effort and energy on a particular task
You have put your back into studying english since 2 month ago.
by Aryamehr December 26, 2016
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Look out or backs you up, supports you in whatever choices or decisions you make, protects you from harm in the world as well as protecting you from harmful people. Sticks up for you when or doesnt allow others to or are talk/talking about you
Just know I HAVE YOUR BACK no matter what you decide.

Dont worry I'll HAVE YOUR BACK if anything happens
by JujubetTheMinion November 2, 2019
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Addiction, mostly heroin/morphine addiction.
Hey dad, you been smacking da H again, quit it bitch, you have a monkey on your back

But the morphine eased the pain,
And the grass grew round his brain,
And gave him all the confidence he lacked,
With a Purple Heart and a monkey on his back.

There's a hole in daddy's arm where all the money goes,

-John Prine - 'Sam Stone' a song about a vietnam vet returning to the US with a monkey on his back.
by GG Allin11 September 1, 2013
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When you are a mark named Mark and are either walking or standing still and a target or green light and red scope are behind you and on your back.
You did the right thing and walked away, but you should know there is a target on your back now.

Watch your six when you can't be my nine.
by MrMathAllOfYous November 10, 2020
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