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1.
A variation on sad panda. When you're so sad, you need an inanimate object to describe the depths of your despair.
Tia: "I can't believe we missed our flight!"

Kai: "Sad pants."
by blackdogeater August 02, 2011
 
2.
The pants emo kids wear. They are tight, narrow leg jeans, that are black, just like the souls of the emo kids that wear them.
Eli: Look at all those cool kids standing around.

Sean: Yeah, they are pretty depressed and angst ridden about their life and the second hand bmw their parents bought them.

Eli: How can you tell?

Sean: They are wearing sadpants
by Elisabunny March 09, 2010