Green’s Dictionary of Slang

Merry Mac n.

[rhy. sl.; ult. Merry Mac’s Fun Parade, title of the comic section in the Sunday Post (publ. in Dundee) in 1960s–70s]

(Scot. drugs) crack cocaine.

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[Scot]I. Rankin Let It Bleed 213: ‘How long have you been on the Bob Hope, Kirstie?’ ‘You mean the Merry?’ [...] ‘Merry Mac, crack,’ he explained.