OSO

"Other significant other". A non-primary partner in a polyamorous relationship; a fuck buddy or friend with benefits.

"meeting new OSOs always makes me nervous."
"My SO found a new friend online; she's already talking about making him an OSO, which kind of squicks me."

OSO by guyjin March 23, 2007

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Oso

The delicate art of receiving a blow job while eating a sandwich ("sammich") that was lovingly prepared by the woman performing the blow job.

I thought getting a blumpkin was good, but getting an Oso is even better! Nom, nom, nom!

Oso by SacTownFamous January 2, 2012

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OSO

The Don , Top Dog , The king.

OSO said to do it. So I did it. It was OSO so I had no choice.

OSO by ?Idk! October 9, 2020

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Oso

Oso is a realy sweet and kind person who doesn't know how to deal with their emotions. There super hot and funny. They are rambuctous and hyper. Their hard working,caring, are pretty emotinal and have a lot going on in there life. They need friend to be there no matter what so they don't feel alone.

Person 1 "Hey why is Oso keeping to himself."
Person 2 "I don't know he hides his emotions."

Oso by Cuthotgirl October 15, 2018