1) Incredibly mean.

2) Disgusting.
1) My new math teacher is nasty; she gave me three detentions just for sneezing in class.

2) I'm not sure what's in that sandwich; all I know is that it smells nasty.
by Diggity Monkeez February 2, 2005
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A slang term for porn, sex, and masturbation.

Often used by people who want to describe one of the above three while not being too descriptive to avoid disgusting people near them.
Bob: Brah, Jenny and Brad are doing the nasties in their bedroom!
Many others: GET THE BINOCULARS!

Gabe: I caught my brother doing the nasties alone in his room yesterday.

Gabe: Holy shit! My brothers looking at the nasties again!
by FartFucker69 August 22, 2014
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the equivalent of 30 truckloads of shit combined with nasty.
That was nastiful, girl.

You ate that much, u nastiful bro.
by burst of sarcasm June 15, 2021
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no one but Mista Trump may use this word
I met Hillary just last night and tell you what, she a nasty nasty woman.
by thatsagrapegrape September 19, 2020
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Nasti is when something is gross, or nasty, but when you add the "i" at the end, it becomes slutty-ier.
Bob: "That girl Candi is sooo nasti"
Jimmy: "True dat brotha, nasti!"
by Definitely Raining April 25, 2008
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Used often by Marines, as a noun, in reference to individuals that do not meet Marine Corp standards. Generally in reference to physical fitness or appearance.
"'If any of you nasties set off one of these in the dark . . ." Keeping Faith, John Schaeffer and Frank Schaeffer, Carroll and Graf distributed by publishers group west.

"...that is of course if you nasties have what it takes to become part of my beloved Marine Corps. Get some!" mavericmarine, http://www.leatherneck.com/forums/showthread.php?t=33597&page=3

"If you hated the Marine Corps until you got your $30 grand, then all of a sudden you were a motivator, you will eventually fade back into the realm of nasties." warrior0369, http://www.militarytimes.com/forums/showthread.php?t=1559730

by wongerrrrrr September 22, 2008
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