An action or event that is deemed as "Totally awesome."
Tony Hawk's 900 was Sick-Nasty!
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hardcore, amazing, off the chain, tight, rowdy
Man Pirates bar was sick nasty huh Zach? yea fool it was off the chain
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Something that looks sick as in ugly and smells nasty
ewww that belt is sick nasty.
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o shit you kno cait? give that chick some henny watch sick nasty come out.
dope a$$ chick does whatever tf she wants when drUNK
caitlin? yea that chick is sick nasty bro.. she dont give a fuq
Sick nasty is the verbal way of giving five thumbs up and a nice friendly slap on the ass.
BRUH your NIke SB shoes are fucking sick nasty.
a complement on how cool something or somenone is
random person; you look really sick nasty with that boy
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