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The image created on the head of a pint of guinness, or other stout, by the careful.pouring of a skillfull bar tender, often in response to a request for a shamrock, when the request us made too late kn the round, for example after all other drinks have been poured. The Guinness penis may be an accidental creationi if the bar tender is particularly tired and/or emotional, or it may be entirely deliberate if the customer is at fault. It can be avoided by always ordering the Guinness first and by asking the bar tender to 'take one for themselves'
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