Sexual version of a marathon whereby adults indulge in constant shagging over a number of days. Experimentalism is encouraged!
My mate Ken and his bird had a fucking shagathon for 6 days. Lucky bugger.
by charbrad73 November 25, 2009
Having multiple sexual partners in one session. Can also be described as group sex.
Oi come to my house for a Shag-a-thon, ive invited 10 people. We are swapping partners every 10 minutes.
by 1011001 July 14, 2009