Top definition
To listen to a series of Madonna albums in a row (ideally, all of them); portmanteau combining Madonna & marathon.
That Madonnathon last night had me singing Borderline, Survival, and Jump at work all morning.

Society Matron: We are NOT going to Arvin's on Friday--he has another Madonnathon planned and I will not listen to that smutty Erotica album again!
by mr pinky June 04, 2007
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