To be sexually aroused by the same gender.
'Rad, man!' Meaning in essence, 'I want to dip my schlong in your arse dude.'
από Ubermensch 10 Απρίλιος 2005
something that is cool or awesome some times used as radical
wow that's rad OR that's totally radical (rad)
από h.m.l.cx 20 Δεκέμβριος 2014
Several definitions given here are correct in connecting the term to radical but incorrect in the date of origin. Being old enough, I can attest that it was used at least as far back as the seventies.
"The Ninja Turtles never invented a single term. To suggest so is not rad but very uncool."
από sammmyz 1 Δεκέμβριος 2014