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The smell on your body after a long night of drinking. Subsequently Guinness isn't the only beer that supplies this scent.
Will: I had many a pint last night and now I have the Irish cologne.
Mike: How is that bad?
Will: I don't want any teachers to smell it on me, but it does make me smell like an Irish mob lord.
Mike: Now I need some Irish cologne.
by Guinness O'Shaugnassey October 11, 2007
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