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1. Serious Cat
A very fucking serious white cat popularized by imdb.com user Timmys_DownTheBloodyWell. He is Emperor and Supreme overlord of a board called "The Sandbox" as well as President of the Anti-squirrel coalition. In his spare time he enjoys spreading awareness of the seriousness of a thread, killing infidels (mostly squirrels), and he also taking long llama rides on the beach.
*A poster tries to joke in a very serious thread*
Serious Cat: *stares with a look of extreme superiority and seriousness*
2. Serious Buisness
Buisness that is very, very serious. Also the kind of company a serious person could start.
Brianna: Jonny, can I ask you something?
Jonny: Depends, is it important?
Brianna: Let's jsut say its serious buisness.
Jonny: Okay. Sweet.
3. serious sounds
Common Slang for when a musical tune sounds very well produced.

Popularity increased after the music track by Guyver Mearns (A hard house producer popular in the music production community at the time and now famous on labels such as Tidy Trax and listed on Discogs) entitled "Serious Sound / You'll Know It" in 2002 which took/rip an audio sample from an old black and white film (Not sure which) "Time to lay down some serious sound" as a direct dialect quote from an actor within the film.

Later popularity was raised for the saying with the music production website 'serious-sounds.net' (2003) a website for music producers to discuss production aspects of music making.

It has since spread into the music production community as a common expression of appreciation for a music artists level of production skill (Arrangement & quality of sound).
example 1

Listener - 'Those are some serious sounds'.
Music Artist - 'Why thank you'.

example 2

Producer - 'I wish I could produce some serious sounds'
Friend - 'Then learn how to do it'.

4. supa serial
VERY serious about something. Also see fo serial
I'm supa serial you guys!
5. cricket
A game that Indians are very, very serious about.
So they had a strip of ground about twelve feet wide and forty long - one wicket was a trash can, the other was a chair. Jivaji gets the ball and wings it at the wicket, blowing the trash can to tiny little bits.

Cricket is a serious game.

6. cricket
A game that Indians are very, very serious about.
So they had a strip of ground about twelve feet wide and forty long - one wicket was a trash can, the other was a chair. Jivaji gets the ball and wings it at the wicket, blowing the trash can to tiny little bits.

Cricket: a serious game.

7. Serious Jones
A bad injury, generally received from doing something stupid. Teenage boys, for example, are very susceptible to be on the receiving end of a "serious jones."
"Dude, I was broomstick jousting with my girlfriend on the roof yesterday, and she knocked me off. *lifts shirt to reveal gash* Check out this serious jones!"

"Mom, Where'd you get that serious jones?"
"Ask your father."
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