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Rare slang originating in Winnipeg's roughest "hoods" and is used to describe high purity Methamphetamine.
Sometimes shortend to H15, Carbon 10 Hydrogen 15 and Nitrogen is the formula for 100% pure Methamphetamine.
"I just scored some C10H15N, gonna be high for days"
"Come over, I just got some H15"
Related Words
C10H15N could be one of two things.

One, Phentermine. Phentermine is a safe stimulant.

Two, Methamphetamine. Methamphetamine is a highly dangerous stimulant.
ADHDer: I think I'll use C10H15N (Phentermine) in a pill.

Tweaker: I think I'll sniff C10H15N (Methamphetamine). *jumps through ceiling.
C10H15N by HawaiianPunch1 November 20, 2024

C10H15N.HCl 

Noun. The hydrochloride salt of methamphetamine, commonly known as "crystal meth."
Gregory: Hey guys, I'm a faggot and love C10H15N.HCl
Sylvester: somebody shut this hamster up.

C11H15NO 

Methylmethcathinone
Mephedrone is C11 H15 N O, or (one) Oxygen molecule shy of Ecstasy.
C11h15NO
C11H15NO by Mareku February 9, 2010
It is the chemical better known as Ecstasy.
Now you know that the exact chemical for ecstasy is C11H15NO2
C11H15NO2 by Ghost9000 June 18, 2004