Non-Stop Talking Syndrome. The type of person who you can't stand to be around because they just won't stop talking.

AKA: SUPER-diarrhea of the mouth.
Veronika: O hello. How are you doing. What time you want eat dearest next year? Do you know what is going on in Russia right now. It's quite fascinating. As a matter of fact, those Chinese people are taking over the world. O blyhtz yup toy o matz. Sorry boss cookies are one minute late. Oh no what should I -

Ben: Well actually, I believe based on what I learned in AP Euro that the Chinese are slightly behind the Japanese, who actually just were majorly damaged by a tsunami. Oh man, I just realized that reminds me, I got a 99 on my Euro test today even though everyone else got less than an 80. I'm gonna try to fight for the point. Hmm...

Francesco: Uhhhhhh, I'm gonna kill myself! STFU its like you have NSTS or something.
by Double Deucer April 16, 2011
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Short for 'Nipple Show Through', when a woman's nipples show through her shirt, blouse, bra, bikini etc.

'My wife took me to that lingerie fashion show last week. She wished she hadn't in the end. Even where we were sitting, I could see the NST on the models! I think she realised I was drooling.
'Hey, look at the NST on the chick in the pink T-shirt.'

'You missed it mate, she got out of the pool, and man, the white bikini, and, wow, the NST.'
by IJKD August 10, 2021
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NST is a collective group/clique that was formed by a couple of Syrian refugees and immigrants.
These NST kids are wild!
by roog9ine July 26, 2021
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