The increase in popularity of the slang word 'rad' to express a positive reaction to something. I'm seeing and hearing it everywhere now
That's a new one to me. Have never heard it up here. Sounds like the modern equivalent of the Scottish "barry", which was popular for several years recently and meant the same thing. Drove me up the wall!
Well I'm sticking to 'wicked'! I quite liked that one!
As they would say here, AWESOME or, occasionally, cool bananas