Refers to a marathon of the popular ye semi-deposed series Made on MTV. This usually happens in the wee hours of the morning or on weekends when better programmes are unavailable. Madeathons are highly addictive and almost impossible to pry oneself away from.
Sorry dude, I can't go out tonight, there's a madeathon on MTV.
by khrushchev June 22, 2007
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