One of the most important words used to describe Silverfish.
Mary: What is that?
Harriet: Hm? Ew, it's a Silverfish!
Mary: NASTY! KILL IT!!!
by Rei Hano April 15, 2009
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Bacterias or germs, mainly used by fags.
We gotta keep the nasties outta my body by sneezing those mofos out.
by Toxic Rage November 20, 2004
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1. Grodey, disgusting,
2. Difficult, irritating
3. Awesome, kick ass, see also wordpimpin
1. That shit was nasty.
2. Oh, man, that concept question was nasty hard.
3. Oh ya man, it was nasty awesome.
by Prof. Alex Delp September 1, 2003
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Acronym for National Strategy for Trusted Identities. Pronounced the same as "nasty".
Some people have started referring to the proposed "National Strategy for Trusted Identities" as NaSTI, as both a time saver and as an opinion.
by empathy4uTM January 11, 2011
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A nasty is someone who does not bathe, brush their teeth, or even attempt any sort of hygienic activity.

They are typically very loud and obnoxious, and cannot comprehend normal social etiquette. They like to loom in the distance and listen in on normal people's conversations, walk too close to you, and generally act creepy.
Nasties tend to group together, and it is not uncommon for them to become a clique, where they will proceed to inter-date and fester in their own little worlds.

Everyone knows a nasty. No one can escape their greasy clutches. The best you can do is avoid eye contact and sit as far away from them as physically possible. Becoming friends with them will only make you miserable and a social outcast.
Nasty: Hey.
Student: Oh... uh, hi.
Nasty: We used to ride the same bus. Remember that hat you let me borrow?
Student: ...Yeah...
Nasty: I still have it. It still smells like you, too, lol.
Student: FFFFFFFFFFFFFUUUUUUUUUUUUUU

Student 1: Oh my fucking god, that nasty is creepy as HELL.
Student 2: Fucking nasties.
by bathe regularly, children. November 14, 2010
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The act of thrusting "Domino's Meatlovers Pizza" into a human vagina. Usually resulting in pizza remnants in said vagina, thus leading to maggot infestation of vaginal canal and surrounding genetilia.
Ben did you fuck Nikki last night?
No I did the nasty instead.
by Sailboatsmeller69 August 8, 2011
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