We found one dictionary that defines the word scaghead:

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1. scaghead: Wiktionary

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