1. UnderDeveloped Pussy, the vaginal organ of a young woman, ie. under the age of 13.

2. UnderDeveloped Pussy, the owner of said vaginal organ.
Man 1: "Yeah bruv, you see that UDP strut past?"
Man 2: "Yeah, dirty f**king slut!"
by Alistair12 May 11, 2009
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Upper Deck Poor. A term used to describe people who cannot afford lower deck tickets at football games. Most notably at Clemson Football games where the term originated due to dippin' dots not being served in the upper deck concession area. Term can be used to describe any person who is too poor to do things the right way.
Alan: Hey man did you end up getting that 22' Sea Hunt?
Steve: Nah bro. I'm too UDP so I had to settle for the 16' Boston Whaler
by Deshaun W. August 28, 2017
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Oh, man I thought he was a decent guy; until I received that UDP...
by the_dodo April 18, 2022
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