The best thing to say when someone annoys you very much. Used to applaud one's stupid acts. Most commonly followed by the word, "asshat".
Random Driver 1 cuts off Random Driver 2.
Random Driver 2: Thank you very much. Yeah, Happy Fuck You Day, Asshat!!!
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Phrase used in American Wedding by Stifler.
On cake: Happy fuck day ass mouth.
Stifler: Thats pretty cool.
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