probably used by the Z-boys (and me) to expess extreme delight at some completly, outstanding, overpoweringly decent. Also probably started by stoned aussie surfers from the stoneage, along with narly, bogus, dude and surfing
Livi skatepark is RAD as fuck man!
by SanJ Street August 03, 2003
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
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
A cooler way of saying somthing is awesome. Coming from snowboard and skate roots.
generikal.com is so ill its rad!
by generikal.com April 27, 2003
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
abbreviation of radiator.
the rad isn't working! i'm fecking freezing.
by kellykellyrob April 14, 2007
Rapid application development. Used to describe programming languages such as visual basic that speed up development time.
By the time I wrote a game engine in C++, the game was finished in Visual Basic.
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

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