Top Definition
A day of the week resulting in which you're weak in some catagory. mental , physical, or both. This can cause you to do things you normally wouldn't do or cause you to not do things you normally can.
dude i had such a weak day i couldn't stop flirting with taken girls!

This weak day sucks i couldn't life a 20 pound bag.
by jttomaiko May 19, 2010
1 more definition
A weekday that results in very poor business for cinema halls, pubs etc who then end up waiting for more customers on weekends.
Last Wednesday was a weakday because there were only seven people in the movie hall watching the latest Potter film.
by Mohit Hira November 24, 2010

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