Possibly the gayest word ever spoken in the hippie language, Retarded, stupid and completely over used in the pot head community.
Dude: Yo, man that was a totally rad party last night.
Person: Your face!!!!!!!
Dude: What ever man your not rad.
Person: Kill yourself!
by ZetsuTheForbidden September 12, 2009
Short for "radical," it's a word that needs to come back. Often used in conjunction with dude.
Dude, I can't believe that you memorized the periodic table. That's a totally rad waste of time.
by Quam Celerrime August 06, 2008
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
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.
A popular misconception by the 21st century kids that "rad" is short for "radical", whilst it can be, it is more popular with ex-hippies from the original counterculture of the sixties to stand for "rock and drugs", ergo, rad. Though, it can still be used in context as, "that party was really rad," but therefore implying that there was rock and drugs at the party.
L: What ever happen to just plain sex, drugs, n rock n roll?
B: I don't really know why they left the 's' out, I guess you could say rads.

Rads.
by Missus Jackie Gleason May 12, 2008

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