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Wiktionary
big h

n. (context slang English) A street name for the drug heroin.

WordNet
big H

n. street names for heroin [syn: hell dust, nose drops, smack, thunder]

Wikipedia
Big H (rapper)

Adrian Harris, better known by his stage names Big H and Big Hooligan, is an English grime hip-hop artist from London. He has a distinctive flow.

Usage examples of "big h".

Yonder wall that looks like a mountain to you is nothing but one side of a big hole in the ground.