When you go out on a Friday night and don't stop partying until Sunday.

This is when a weekend (Friday, Saturday & Sunday) all run into one day.
Jim was so hung over on Monday morning after his Fradurunday weekend!

Gina had another Fradurunday and can't remember how she got home!
by Hesher123 August 20, 2010
Get the Fradurunday mug.