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1. A competition of a series of events involving the consumption of alcohol (eg. drinking games).
I'll beat your ass at beer pong in this weekends drinkathon!

Did you hear that Tim died at last weeks drinkathon?

Dude, i woke up blind-folded with a ping pong ball in my ass after yesterdays drinkathon.
by Blake and Logan September 17, 2006
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