When something is just so insane and unbelievable.
"The way that chick ran track today was sick nasty"
by Taylor Sprizzzzzzleee April 20, 2006
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Reeaally dope. Something is just really fucking cool.
"The purse I got is sick nasty!!"

"Yo dat blunt was sick nasty!"
by Hiiiyaaa December 28, 2009
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When I had first used the combination of sick and nasty, I had no idea others had used it before.

During a trip to Mexico on June 8th 2006, a friend spotted something gross outside the car. I looked over and my first thought was nasty, the words "freak-nasty" came out of my mouth instead. He replied by saying "sick", I then used the combination of thoughts and answered back "sick nasty!"

After my discovery, I used this "new" phrase a lot during the trip. I found lots of times to use "sick nasty".

1."sick nasty" to me, means some that is really good, exciting, amazing, etc.
2."sick nasty" can also replace words such as: wow!, dang!, shazamm!, etc.
3."sick nasty" is often times used for something that is gross or disgusting. like: gross!, yuck!, nasty!, etc.

Sick nasty is commonly used as a phrase of exclaimation.The phrase is usable in many situations, its meaning is mainly dependant on the delivery, tone, and annunciation.

"go back to being drunk"
"meh,ill sick the bubble bees on you..."
1."mexico was great I had a sick nasty time there"
2."what is that over there?...OH Sick NAsTy!"
3."did you just eat that?..SIck NasTY!"
by Dr. Sick-Nasty June 17, 2006
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Noun. An unacceptable person with questionable intentions and goals that will more than likely stay in Antigo for the rest of their lives.
Wow, now that's a Sick Nasty, I wish they would move out of Antigo and get a job.
by A-KnowsBest January 16, 2011
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Sick nasty is used to describe a situation, person, or thing so disgusting and gross that it deserves to be called both sick and nasty. Sick nasty can be used in almost all context, I mean what isn't sick nasty?

(orgin the celtic swim '06-07 team)
Wow that shirt is really sick nasty. I just wanted to gouge my eyes out today when I saw Brett because he is so sick nasty. etc
by Celtic Swim '06-07 January 28, 2007
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When something is super awesome/cool/tight/sexy... etc

since two negatives makes a positive (sick- bad, nasty- bad= good)
That board is sick-nasty.

Everything that dosn't involve __________, is sick-nasty.

Your mom is sick nasty.
by reveingiallo March 5, 2008
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to explain something of importance.
to be amused of another thing.
by Alex =) June 17, 2006
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