Top Definition
A Dirty Flanagan is a commonly used term in Ireland. It is when a man drinks all his Irish Whiskey, he takes his penis and inserts it into the whiskey bottle and ejecaulates. He then shoves the bottle up the womans vagina/ Man's but.
Professor: Seamus where were you last night?
Seamus: I dont really know... but my friend Aiden told me that I got so wasted that he gave me a Dirty Flanagan.
Professor: Umm.... CAN I HAVE ONE!
by FLibbidy January 24, 2011

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