We found one dictionary that defines the word blackstuff:

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1. blackstuff: Wiktionary

Definitions from Wiktionary (blackstuff) ▸ noun:  (UK, slang) Tarmac. ▸ Words similar to blackstuff ▸ Usage examples for blackstuff ▸ Idioms related to blackstuff ▸ Wikipedia articles (New!) ▸ Popular adjectives describing blackstuff ▸ Words that often appear near blackstuff ▸ Rhymes of blackstuff ▸ Invented words related to blackstuff