Is there a German slang for "No?

Question

I know in German, nein means no. However, I have heard some German speakers say something for no that sounds like "knee". Is this an entirely different word, or another way to pronounce nein?

Answer 1

No, means no

Answer 2

YO! Nein !

Answer 3

idk, i only know of nein i dont think iot is important though to havwe a slang one, you really wont need it i think ;)  

Answer 4

"nie" as in "nie wieder?"

"nie" means 'never'

Answer 5

Colloquial ways to say "nein" include nöö (sounds like nuuuuh) and nee (naay).