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1. Monkey on your back
To have an addicction, especially a drug addiction.
Man, he's got a monkey on him back! He's so wasted!
2. monkey on your back
To have some very burdensome nuisance you have to put up with--in a sense wider than just a drug or other addiction.
"That huge credit card payment is a real monkey on his back." "Trying to sell that white elephant must be a monkey on your back."
3. monkey on your back
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.
4. Monkey on your back
Severe relentless back pain one gets during opiate withdrawal.
hardest part of detox will be the monkey on your back