wicked

adv. = very, extremely, etc.
adj. = cool, great, big, beautiful (any positive meaning appropriate to the noun)
Could be either adverb or adjective at least as early as 1972 in New England when I started using it.

That was a wicked home run. He hit it wicked far. Except I missed it because I was checking out that chick -- she's wicked nice. That halter top is wicked!

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