1. something generally good or fun

2. something gangsta or crime related which is impressive

immortalised by garage emcee JME, "it's serious, serious". and so on.
1. "oi this new Mos Def song i got is serious"

2. ye i heard about that boy that pars around E8 but he's a pussy, he aint serious"
by Lord Sinista October 28, 2005
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The serious gorilla at the zoo scares me.

I have a serious dad.
by frabrizio October 4, 2016
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Used to differentiate between the two most common reasons for visiting the loo. Allows for open discussion of bathroom activities in public or in mixed company.

n. a bowel movement

v. to defecate
Bill: I need to go to the bathroom before we leave.
Tina: Is it serious?
Bill: Yes!
Tina: Then we'll never get out of here!

-or-

Bill: I know you're still putting on your makeup in here but I gotta go serious!

-or

Bill (with newspaper tucked under arm): I'll be back in 20 minutes, I have to conduct some serious research.
by ctrlU January 26, 2010
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1. Wanting to be with someone without commitment.

2. they don’t really want you
He said it’s not serious, so ya know.

Nah bro it’s not even serious
by Medium_biscuit January 8, 2019
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When the coach said they would have to do 100 push-ups they all replied, "are you for-serious
by jd April 11, 2005
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Meaning: are you being serious? Is this for real?
Pam: I won tickets for us to the Atreyu concert tonight!
Alex: For serious? That's awesome!
by Alexis Darling August 12, 2008
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adjective; also known as "real serious," "real fuckin serious," or "RFS."

used to describe generally negative associations, or making a reference to one's mental standing (under the influence).
1. That bitch with the hideous extensions is real fuckin serious!

2. After waking up with last nights makeup still on, I am RFS!!

3. I've smoked too much... I'm serious!
by pam/smashing pandora July 29, 2005
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