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a stuck-up or snobby person, usually a girl or gay guy.
Alice: Did you see Chandra and her new Gucci purse?

Alex: How could I not? She kept on shoving it in my face. Damn, that bitch is so poosty!
by rebelwithacause911 March 17, 2010
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A mixture of PEE-YOO and NASTY. A very versatile word that describes anything bad, disgusting or foul.
From behind a bedroom door: Debbie: "Oooh David. Eat my pussy!" David: "sniff sniff {gag} whiff Fuck no bitch, you're POOSTY!! Shmelly ho!!!".......Alan stop farting, you POOSTY fucktard!!.......I can't eat this POOSTY fruitcake!!.......That band sucked last night they were so damned POOSTY!
by Dakeboy 59 January 05, 2012
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Someone who is being cranky or moody, like a girl on her period.
Emily is being so Poosty today.
by Bajdkdncn.&/&2$3&: September 22, 2016
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A cross between, a Pussy and a Shit head.
A word inwhich you would call one of your friends.
"what do you mean you can't come anymore? God Katherine you're such a Poosty.."
by Vag. GG February 26, 2008
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adj.: nasty, gross, old, dirty, moldy, musty.
In the way that a bucket of dirty water left sitting around in the basement for a year is nasty.
by Sarah McMenomy November 16, 2003
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