Green’s Dictionary of Slang

Mick Jagger n.

[rhy. sl. on basis of pronouncing ‘lager’ with a short Scots ‘a’; ult. Rolling Stones singer Mick Jagger (b. 1943)]

(Scot.) a glass of lager.

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[Scot]T. Black Ringer [ebook] I’m downing the first gulp of my Mick Jagger [...] when I feels a wee tug on my shoulder.