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A term for one's significant other, to be used by adult heterosexual couples in long-term or lifelong, monogamous relationships who are serious, live together and have built their lives together, but have yet to get engaged or don't intend to marry at all.

Where "boyfriend/girlfriend" is too childish, "husband/wife" doesn't apply, "fiance" is dishonest, "partner" sounds homosexual and "lover" is too sexual, there is serioso. Coined by Chemda of the Keith and The Girl podcast, episode 130.
"My serioso and I are coming up on our six year anniversary."
Serioso by thatartychick January 11, 2008
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seriosity 

gravity, solemnity, sobriety, demureness, staidness, grimness,
I make this observation
With no animosity
And just a tiny modicum
Of curiosity:

Apparently there’s no such word
As seriosity
And it is my opinion that
There surely ought to be.

So in conclusion, I must say
(I hope you would agree)
This glaring oversight
Is sheer ludicrosity.
seriosity by skyweeder September 4, 2009

seriosity 

seriousness, an event, action or situation with the attribute of being serious.
that was a bit of silliness but now for some seriosity,
the seriosity of the event meant that I couldn't help but burst into a fit of giggles
seriosity by lairyfairy June 1, 2006

serosorter 

aw, glad to be a philanthropist for higher education.........

serosorter: one who sorts potential sex partners by HIV serostatus, usually referring to poz guys who like to only have bareback sex with other poz guys (not into the whole bugchasing or giftgiving schtick). term was brought into public consciousness over the past year in numerous publications, most notably by Dan Savage in Savage Love
"Dude, you stand no chance with him. You're neg and he's not only poz, he's a serosorter"
serosorter by One Charming Bastard September 28, 2004

seriosity 

the NOUN form of the word "serious"; the best word ever.
"I just fell, but in all seriosity, I love life."

r u serios 

Internet slang meaning, "are you serious?", usually followed by the disbelieving remark, u canot b serios.

see serios
n00b: my license got suspended
reply: r u serios? u canot b serios! OMG WTF!

seriosly 

Brian - "did Jeffy seriously just spell seriously without a U?"

Nick - "yea, what a retard....."

Seriosly
seriosly by Jeffy Roebuck June 29, 2011