1 )When a person is subject to something so depressing or disheartening that it eliminates or prevents all evidence of sexual arousal.

2 )The opposite of being happy in the pants.

1 )Shannon was really mean to me before Christmas; I was sad in the pants for a whole week.

2 )Today Claire told me that just because I was necessary didn't mean I was important. That made me sad in the pants.

by Michael Thomas December 19, 2006
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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 3, 2011
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A term either to describe a person (usually female) or a phenomena in which they attempt with a desperation to fit into a pair of skin tight jeans or booty shorts that don't fit at all. The result is people first noticing then running away screaming in disgust. Also, the said jeans or booty shorts look like they are crying for the person to evacuate their space which is beyond any reasonable capacity. Hence why it is referred to as sad pants.
Jesus H Christ Sad Pants!!!! Do you own a pair of jeans or shorts that have actually lived!?!?!!?!?!?
by O.G. Junior Mint August 13, 2015
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