Top definition
The act of engaging in sexual intercource for an extended amount of time.

Origin: USA (screename)
A 40 minute handjob by Jessica Beil's man-arms is a sexathon.
Dude, last night was a sexathon.
I lost the sexathon.
by Duncan1382 July 26, 2007
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2
a festival in which a massive gang bang takes place and many people come to purchase sex toys and thongs of all sorts.
sexathon is this weekend you coming.
yep got my thongs and viagra ready!
by quipster69 April 16, 2011
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