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1.
A woman dating man after man without a break in between.
That girl just dumped me for another guy, she is doing a manathon.
by -xRobyn Banks February 18, 2009
 
2.
Two or more guys who spend a huge amount of time together without any women present.
Edward and Gerald ditched their wives for the weekend and went for a manathon of fishing and drinking.
by Leonard Loughborough September 27, 2010