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1. Niels
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."
2. Niels
Niels Henrik David Bohr: 7 October 1885 – 18 November 1962) was a Danish physicist who made fundamental contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922. Bohr mentored and collaborated with many of the top physicists of the century at his institute in Copenhagen. He was part of a team of physicists working on the Manhattan Project

Another definition of this word: champion.
Wow that person is a real niels
3. Niels
Someone while under the influence of marijuana runs away from cops at great speeds. If a cop is spotted 50 yards away from them arresting someone else, they decide to sprint away.
Reilly: hey look theres a cop down near rite aid.

Niels: fuck!!!!!!!!!!!

Dain:Where did niels go?

By this time niels is about 50 ft away running 20 mph.
4. Niels
A slang, or "street-name", for the wonderful drug MDMA (Methylendioxymethamfetamin) which is said to contain bits of real panther. When this "drug" is taken, one experiences a euphoric high while simultaneously boosting ones showmac skillz x 100000000!
HV på Niels i går!
Har du noget Niels?
Skal vi være sammen med Niels i dag?
Niels er min bedste ven.
Niels conquers all <3
5. Niels
The most horribly smell ever. It looks like a pig pile of shit and it smells horribly.
Oh dude just had the most amazing niels ever.
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