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Overpriced, tampered with cocaine that only a mug would buy.

mug being slang for a stupid person who is easily duped
dust being slang for cocaine

Origin: Newcastle, Northern England
"D'yer fancy some mugdust like?" "I say old chap, fancy a line of mugdust?" "Archer, meet yer in the bog fer a line of mug!"
by Damien Darkwater September 01, 2007
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