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someone who has sex his girlfriend and then break up with her.
"I had sex with Emma yesterday." "Awesome! you gonna marry her?" "nah..i'm gonna break up with her." "omg, you're such a Niels."
Niels by Bantumie September 15, 2009

Naughty Nielsen 

The act of spanking your sexual partner with the Holy Bible, or something that resembles the Bible. This is a common practice in BDSM and Fetish’s. The significance of Nielsen is there is a type of paddle used in BDSM practice that is called a Nielsen Paddle.
I thought Ian was a nice church boy, until he bent me over and did a “Naughty Nielsen” On me.
Naughty Nielsen by TheLoaners July 10, 2018
The rotted remnants of seman left behind after gay anal sex.
Dont get that Nielson on you. You'll never get the smell out.
Nielson by Johny Hopkins January 30, 2009
The name of the most amazing guy in the world. He is incredible, smart, fun, creative, and really cute. When you are stressed, he’ll listen to you. He may or may not enjoy smoking weed, drinking beer, and consuming a certain type of “stracciatella” cottage cheese.
“Hey I think I have the biggest crush ever on this guy. I dream about him every night and during the day too.”
“What’s his name?”
“Sexy stuff.”
“No really, what’s his name?”
“Why should I tell you?”
“You shouldn’t, but tell me anyway.”
Fine, his name is Niels, and I’m in love with him.”
Niels by Bandittt_fire January 19, 2021
Niels have a huge penis
Girl1: Do you know Niels?
Girl2: Sure this is the guy with a huge penis
Niels by Toastbrot November 18, 2016

Nielsisme 

1. Alle seksuele dingen niet leuk vinden, of haten.

2. Alle seksuele dingen lelijk vinden

Dat houdt in: borsten, vulva's, piemels, konten etc.
Stijn: "Yoo, deze chick heeft echt lekkere tieten."

Niels: "Ieuw Gadverdamme, haal dat weg!"

Mark tegen Bart: "Damn, ik denk dat hij Nielsisme heeft."
Nielsisme by StevieNotAWonder January 6, 2023