I phrase used by young people, similar to yolo who enjoy living and want to do everything that they can when they have the chance instead of missing the opportunity and behaving like old/middle aged people when they could be having fun.
If this is properly followed it leads to the most memorable nights in your life.
Jack: I'm going to a party
Jack's mum: Why?
Jack: Cause I'm young

Tom: Dude why the hell are doing this?
Jack: Cause I'm young
by Bandit, the Fearless Ferret December 23, 2012
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A small phrase said when replying to a question of stupidity.
A couple of friends are watching a scary movie and one of them farts really loud just for the fun of it.

Jack: "Jeez! Why the hell did you fart!?"

John: "'Cause I'm Best!"
by Gerber Baby January 6, 2008
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The number one reason and/or excuse for any situation. Also highly effective in college applications.
Them: "You just let three pigs loose in the school! How the hell were you able to get away with that?"

You: Cause I'm swag like that

--or--

Them: "Why should we accept you into our university?"

you: "Cause I'm swag like that"
by Javalin597 July 24, 2011
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This is a phrase used in counter-strike or any type of PvP / FPS / RTS game. It is used to taunt your opponent when you have either landed an amazing head shot, double kill, or completely owned a bunch of noobs.

Term came to light on the well known tube video 'mad cause im stylin', where a rap battle took place and the guy who used the line got socked in the face.

Basically, it is used to anger your opponent and declare your dominance.
Noob: You, you're a hacker!
Noob: OMG HOW DID YOU GET ME THROUGH THE WALL LIKE THAT!!
Random guy: RAINDROPS!!!!
You: lol you mad cause I'm stylin on you??
by complexity 3D SK MIBR NiP April 10, 2007
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