English · Slang Candidate

number four

Proposed by a contributor, not yet supported by evidence.

Meaning · English

heroin

Where it’s used: Used American English

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Common questions

What does “number four” mean?

heroin

Is “number four” formal or informal?

number four is generally slang.

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