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1.
Street slang for heroin.

Referenced in the Sublime song "Greatest Hits" in the lyric:
"Well I got my yellow cat and my wooden baseball bat."
Erica - "I gotta hit up my dealer for some yellow cat, I'm tryin' to nod."
Erica's friend - "You're a fucking retard..."
by Ricky Gonzalez III February 03, 2014