Word from the 70s/80s indicating something "cool" or "awesome".
Anyways, the new generation started to use it because they have an identity problem, and to hide their obvious personal/sexual confusion, they use this word.
"Hey Darryl, thats a RAD gun you got there!"
"Thanks Johnny, i will use it to shoot people in my SCHOOL"
"Oh reallyyy? Thats RAD"