What is K Rad?
Someone who has passed the normal level of "Rad"
That was fuckin K rad
OK, radical. Radical was a common slang word for really great mostly used in the midwest USA in the early to mid 1980s. K rad, k bye, and k cool were alternatives to just "bye" on the phone, and later trickled into BBS sysop quit messages. k-kool also appeared on BBS's.
caller: I should have the file uploaded in 30 seconds.
receiver: k rad, got it.
caller: k bye