Definition
Slang for heroin or drugs in general, but also used metaphorically for anything dangerously addictive and self-destructive. If something's 'smack,' it hooks you hard and doesn't let go.
Example Usage
I can't stop reading that webcomic—it's pure smack for my brain.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=smack&defid=6428)
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See “smack” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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gtfbtw
get the f**k back to work...