U.S.Y
Usually
Sexually
Active.

a person who loves sex or make out or anything with 2 couples doing something that involves having body parts in each other, or trading saliva, uses their charm to get and meet people.
Dude hes such a USY, you shouldve seen all those chicks after they came out of his room. they were fucking dramatized they have never felt the best sex.

Dude shes such a USY, she just came up to me pulled down my pants and sucked me.
by Kid25 January 10, 2010
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When you get home from a USY even (conventions, dances, trips etc...) and you are really overwelmingly sad that the event is over and you look back at you time and was like woah i did some crazy shit at USY and you miss all your friends and you start counting down the days till the next event
Rebecca: Yeah I just got home from Spring Convention
David: Oh yeah me too
Rebecca: AHHHH I WANNA GO BACK NOW!!!
David: yeah USY= life
Rebecca: Deff
by Jappy Jew May 25, 2005
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also known as PCDS, or "post convention depression syndrome"

when you come back from a USY convention feeling all sad and missing your friends.
other usyer: i'm having lots of usy withdrawal right now.

new fro usyer: you mean "hella PCDS"?

other usyer: yeah, that.
by kerflugenbachten July 15, 2008
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the feeling of utter depression and exaustion after attending an overnight USY event that you will litteraly fall asleep on anyone.
the freshman had such a USY Hangover after R.C. that she fell asleep on a senior while her pillow pet was being passed around the room.
by beatlesfanatic97 May 30, 2011
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palangi friend: hey you! mata usi!
tongan friend: yea me too. teu tuki’i koe. usi.
by therock_ July 18, 2020
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The best Jewish summer program you will ever attend. Whether it's traveling cross country, Israel, east, west, or cruising to Alaska. USY on wheels will create memories and friendships that last a lifetime. Singing Ruach, Shabbat shopping, and night time bonding activities are just a few of the amazing experiences USY on wheels has to offer.
I can't wait for USY on Wheels this summer!!!
by Danielab13 August 24, 2017
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