abbreviation of radiator.
the rad isn't working! i'm fecking freezing.
by kellykellyrob April 14, 2007
definately the new word fer "cool"... so much cooler than cool
you: you're rad
me: thanks... i am quite rad
by josprettyrad August 22, 2006
awesome,wonderful but could be risky
(After a motorbike ride) That was so rad!
by gaur August 16, 2012
n: a unit of measurement used to describe a dose of radiation. A single rad is equivalent to 100 ergs per gram or 0.01 joules per kilogram of irradiated substance.
The Federally-defined maximum occupational radiation dose is 5 rads per year.
by Ten Second Tom September 29, 2005
Another way to say "high"
Phil- Hey bill, did I tell you about the party last night?

Bill- Phil, I was AT that party last night

Phil- Well fuck... I was really fucking rad last night...

Bill- yeah.... you were Phil...
by Charlietoes August 22, 2009
1. (n) Friends =O
2. (adj) To be exceedingly cool.
OMG DUDE!your friends are frikken rad!

HAHA That Erin Kid Is RAD!
by KAYLEEEEEEEEENN January 11, 2008
A word that gained popular usage in the 1980s. It is an abbreviation or "radical," and is a synonym or cool and/or stellar. Synonymous with surf bums and teens who think they are still in the 1980s.
Surf bum: Duuude, I just got tubed in the most righteous wave today!
Valley girl with big blonde hair and spandex: Like, ohmygod, that is SO rad!
by Sir Joshizzle July 14, 2006
A term used to describe a punk who doesn't restrict him or herself to one genre or another, though most likely has a certain preference. Describes one who is completely devoted to music; holding it and its ideals above all else. It is a state of such complete awesomeness that when someone achieves it, it will no longer matter to them.
Rad is for the kids whom Music=Life. See Hardcore Bandana
by Cubone of the Pokemon Mafia February 12, 2006

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