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British slang for someone who purchases or solicits the purchase of Crack and/or Heroin.

It originates from a dealer named Grey and his customers that were often sighted around.
So the word Grey and customer were blended together to make Grustomer.

Ironically the slang words for Crack and Heroin in England are White and Black or Light and Dark - In that order.

These colours mixed to make the colour grey.

Synonyms: Budgehead, Crackhead, Nitty, etc.
Max: Ew, there's bare grustomers about.
Carl: Yeah... Fuckin' nitty.
via giphy
by FeelsGravyMan July 29, 2018
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