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1.
An individual whose very presence lowers the tone in the room. Will complain about almost anything and will dress in plain, understated clothes. The human equivilent of Eeyore from Winnie the Pooh.
"Hi everybody. Hope you're feeling better today than I am. Still can't find my Prozac anywhere, I'm getting really worried now. Must the Sun rise every morning in the east? Why can't..." - ad infinitum.
by Mr Ben February 09, 2005
 
2.
1. a sack of sadness

2. a character from the 80's childrens cartoon "Raggy Dolls"
fuck you're a sad sack
don't be such a sad sack or i'll punch you in the mouth
by sad sack July 15, 2005
 
3.
A person who's only role in a friendship is to listen to the other friend whine and complain about their troubles.
Lisa only calls me when she wants to complain about how bad her life is. I'm tired of being her sad sack.
by ButThePantsStayOn April 10, 2009
 
4.
A person who goes by a false name. Works at a company where he is just an extension and likes to think of himself as a Loner where he is infact just a social reject with friends.
Ryan Campbell AKA Ruan Lategan is the biggest sadsack I know! He even makes Eyore look happy
by Extension 4040 April 20, 2011