From Urban Dictionary:
To create Lean, a popular drink originated from Houston Texas, you require the following for the original formula:
-Promethazine w/Codeine VC <- Sizzurp (active ingredient)
-Original Sprite Soda <- Mixing ingredient (although different flavors of sprite are now used, such as sprite remix)
-Jolly rancher candy <- Flavor additive
Put it all in a styrofoam cup and enjoy. The codeine is mainly responsible for the euphoric feeling after drinking lean. Promethazine causes motor skill impairment, lethargy, extreme drowsiness, as well as a disassociative feeling from all other parts of the body, specifically the stomach and digestive system. If it doesn't have promethazine w/ Codeine, it isn't real sizzurp.
The mixed drink combination known as "lean", is normally the color purple, due the added ingredient sizzurp, which is originally a dark purple syrup. There are other colors of sizzurp which can be added to create lean, but the purple is the true sizurp.
Lean does not contain ANY form of alcohol, crushed pills, or other liquids in general.
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From Wikipedia:
Purple drank is a slang term for a recreational drug popular in the hip hop community in the southern United States, originating in Houston, Texas. Its main ingredient is prescription-strength cough syrup containing codeine and promethazine.[1] Cough syrup is typically mixed with ingredients such as Sprite soft drink or Mountain Dew and pieces of Jolly Rancher candy. The purplish hue of purple drank comes from dyes in the cough syrup.
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Trayvon ran with a crowd that used "lean" and this was prominently featured on his various social media outlets until those were scrubbed after he was killed with some of the starter ingredients for a batch.
The customers in the 7-11 at the same time were buying bunts.