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Slang that needs to make a comeback
(hexbear.net)
Rad
Beans (as in "That's the beans!")
Gnarly
Groovy
Milk drinker (as an insult. It means "You're a baby that still drinks milk" good for insulting white people)
I still use rad, albeit exclusively to refer to animals irl and monster designs in media.
"That's a rad little dude." -me, looking at cool bug.