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An expression used to describe something that is über cool, awesome, amazing. From the slang word "rad" an abbreviation of 'radical'--made popular by the Teenage Mutant Ninja Turtles and skaters in the 80's. Being rad is the highest compliment you can give. Also used as an expression of awe.
"I couldn't decide whether to get the Ferrari or the Jag so I got both"

"Radbag!"
by dds007 September 21, 2012
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2
Used to describe an event that is so radical that it is indeed a whole bag of radicalness
Guy: Dude i fucked your mum AND your dad

Dude: Rad bag
by John Scroyne February 14, 2007
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