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
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 word brought back to life by a couple of high school kids in 2003 during third hour, which is rapidly growing in popularity.
Joey: "Dude, we should seriousley start saying rad"
Alex: "I second that motion"
by nello killer March 26, 2005
rad is the rassest word ever
rad is so rad, its radder then plaid , because everybody knows plaid is so rad
by anarchyincanada June 18, 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
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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