We don't have synonyms for greebo yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are grebo, greeno and freebo.
(n) :
Alternative spelling of grebo. [(slang, UK, countable, chiefly West Midlands) A greaser or biker; a member of any alternative subculture, as opposed to a chav or townie.]
(n) :
Alternative spelling of grebo. [(slang, UK, countable, chiefly West Midlands) A greaser or biker; a member of any alternative subculture, as opposed to a chav or townie.]