Top definition
When you watch all the episodes of all the seasons of an entire TV series over a short-period of time. i.e. a mega marathon.
I haven't left my house in a week, I've been megathoning 24.

Let's see, I have two weeks between when my job ends and school starts. And I haven't seen The Wire yet. You know what, I think I'm going to megathon it.
by Philosophistry June 09, 2010
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