Top Definition
To do 'The Dirty Guinness' one must down one's pint of Guinness then continue to thrust said empty pint glass into ones face, shattering it in the process.
Paddy O'Halloran: I can't make it into work today boss.

Boss: Why might that be Paddy?

Paddy O'Halloran: I only went and did The Dirty Guinness a few times last night, it was Finlay's stag do!

Boss: Good lad Paddy, I'll be seeing you tomorrow then.
by paddy mc'shay February 17, 2011

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