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1.
Intense; hardcore.
"Things are gettin' serious up in here."

"I made some serious cash last night."
Por **** you 18 de marzo de 2003
 
2.
Slang word used in the north of london
meaning some thing good.

or

some one that does not find what they do important.
Them creps are serious cuzz.

or

"Your not serious"-JME of meridian crew
Por Voltige K-I-D 10 de junio de 2004
 
3.
Grave in quality or manner, or being of such importance as to cause anxiety.
- like making sure that your space shuttle is safe to use to re-enter a your own planet's atmosphere... THAT is serious.
Por Anonymous 01 de febrero de 2003
 
4.
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"
Por Lord Sinista 28 de octubre de 2005
 
5.
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.
Por Clubshub 26 de enero de 2010
 
6.
looking nice....as in someone/something that would interest you.
Wow! Shorty is looking serious in those jeans.
Por Adrianne 24 de marzo de 2004
 
7.
serious is a beast pker and skiller, he rocks the world so hard, like omg look this elite up!
omg dude i saw serious today and he killed all world 26. he is sooo good!
Por [IR]Serious 12 de marzo de 2009