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OOSM pronounced as prolonged awesome (aaaaawwwwesome) aw-suhm. Say it like you would almost scream but don't.
It means something that qualifies as awesome, just double.

Between AWESOME and AWESOMENESS, right in the middle.

Can be used as short version of a very long word aaaaawwwwwesome.
1. That was so freaking OOSM!

2. "When I get sad, I stop being sad and be OOSM instead. True story."

3. a) That club was awesome, but this one is OOSM!

4. It can be used also to double the effect for the cool words like:
amazing, astonishing, inspiring, breathtaking, daunting, formidable, impressive, magnificent, majestic, overwhelming, redoubtable, stunning, stupefying, wonderful, wondrous, mind-blowing, top, fly, spectral, champion, to rule, fabulous, eye-opening, incomprehensible, inconceivable, incredible, unbelievable, unimaginable, unthinkable; extraordinary, phenomenal, rare, sensational, spectacular, unique, notable, noticeable, outstanding, remarkable, impressive, smashing, striking, mind-bending, mind-blowing, mind-boggling, animating, energizing, enlightening, enlivening, exciting, galvanizing, invigorating, stimulating; alluring, attracting, attractive, beguiling, bewitching, captivating, charming, enchanting, entertaining, enthralling, fascinating, interesting, blue-ribbon, like-a-boss, first-class, numero-uno, peachy, tip-top, top of the line, better, slick, nifty, capital...

i.e.: Hardcore beautiful = OOSM
OOSM by partieniml6 April 9, 2013
Urban Dictionary Merch
Out Of Shape Mother Fucker
Fuck that OOSMF! You can’t be tellin’ me that mother fucker is in shape?”
Related Words

oosmorrow 

goodbye lydz...oosmorrow
oosmorrow by thatguykd April 28, 2011
"Man, Adam is being an oosma."
oosma by Dan June 2, 2004

Oosma clare

The place every sick nigga what to come from were everybody eats sand and horses and smokes juul
Boy1: hey i wanna be in Oosma clare
Boy2:you aint the only one
Oosma clare by sucfor12buc November 12, 2018

Oosma Kappa Sigma 

A group of trouble makers mostly made up of soffer kids that love to smoke pot, get wasted and party. They are also well known for vaping in the bathroom and causing chaos in the school.
Person 1: Is that Alex G pouring Captain Morgan for everyone?

Person 2: Don’t you know? He’s part of the Oosma Kappa Sigma, they always on some D8 type of shit
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