Referring to the age of a person. Same as Grown, but with emphasis.
My mother wants to know why I don't I call her anymore, because I'm a grown-ass man, thats why.

A grown-ass man should not be on welfare.
by Crazy Eyes H. Squeeze October 4, 2004
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Some people mistakenly believe this is a term for those over 18. Fraid not. Some people are born grown-ups, and some die at 100 never having acheived this status. If you are one, congratulations on not dying thus far; if not, here's some things you have to look forward to!

• You will cease to be impressed with your 1337speak, pwning people, your h4x0r rep and otherwise talking "liek u r" an illiterate moron. Intelligence, it's not just for breakfast anymore.

• For you emo kids, the world will get brighter for you when you stop crying and get another piece of ass. Life's cyclical in nature, roll with it.

• You will finally understand why your dad always screams when you begin to pay all your own bills. TIP: Pay electricity bill before buying the new GTA.

• Realizing that just because you CAN drink doesn't necessarily make it a good idea. Go out Wednesday, your place of employment might look like the jaws of Hell Thursday morning at 7:00 AM.

• Realizing that your place of employment ALWAYS looks like the jaws of Hell, shrugging and doing what you damn well feel like anyway.

and finally,

• The moment when you are truly no longer a kid, because you can't be. Because you have decided that all kids, without exception, SUCK. Because now YOU have a kid, crying, yelling, wetting the bed, wanting money. Karma's a cruel bitch.

Other than that, it's the only way to be... what else ya gonna do, be a 40 year old skateboarder?

I'm glad I'm a grown-up

or

(Closed captioning for the 1337 impaired)
i r liek ben a grown-up. it's teh w00t.
by Madmann October 8, 2005
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If someone if lookin' grown then they are generally perceived to have grown larger and become more muscular.

Therefore it pertains that a seven stone weakling who hits the gym and pumps iron until he resembles an Adonis is referred to as 'lookin' grown'.

The phraseology can be used as a term of equal endearment and ridicule: just as a weakling-come-behemoth can be lookin' grown, equally a skinny chap can also be lookin' grown when he is in actual fact not physically lookin' grown at all and is being mocked therefore.

The phrase can take on the sentiments of a casual, informal greeting ("Safe child, lookin' grown"), shock ("Woah, lookin' grown!"), lust ("loooookin' grown") and more depending upon context.
by Grollog October 5, 2010
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someone who was born and raised in california
ive been living in inglewood since i was born. im cali grownn bitch!
by xochazzz February 1, 2011
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