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."
by guyjin March 20, 2007
oso
mafiOSO, mafia, mob, vice lords, CVLN
I'M OSO FOOL, he's traight oso dog
by koop da kid April 24, 2006
OSO
A big, fat, lazy person, with no concept of work ethics. May be overheard uttering "you know what?" This person claims, "I only eat one meal a day?" Tells co-workers to focus more on their jobs and then excuses himself for a 3 hour lunch.
Father to son: "Son, you keep slacking like that, you'll end up an Oso."
by Ted Kamprad April 20, 2006

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