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1.
Noun:
1)Klein, a classy term for the word cunt.
2)Specificaly a cunt spelled with a K.
3)Also known as the dirtiest word ever, but can still be used in polite conversation.
4)Can be described as smelling like poon.
"You are suck a Klein."
"I would realy like a piece of that Klein."
"The woman's thigh cast a shadow across her delicate Klein."
by t-fro March 06, 2006
 
2.
Short for "Calvin Kleins" - usually referring to mens underwear available from the designer clothing label Calvin Klein. Most often refers to boxer shorts or boxer briefs.
Check out that guy in his kleins.

I was so hot i got got my nut in my kleins.

I got myself some sweet kleins from the store today.
by ScottyInLondon September 02, 2005
 
3.
An all round nice guy. German for small, not a common name. People called this usually are best in sports and smart along with it. Beats anyone called patrick or Louis. Is mega hot, is basically god like. Also a common jewish surname but has nothing to do with people who have it as a first name. :D
Holy shit is that Klein!
Damm Klein, hes so good a everything.
LEts get that bastard, oh wait its Klein!
by pepito23435 August 21, 2012
 
4.
1. Norwegian for hangover.

2. Norwegian for embarrassed, usually used when somebody have hooked up and are embarrassed upon meeting that person.
1. - Hvordan er formen? (How are you)
- Har vondt i hodet, er så sykt klein fra igår ! (I'm having an headache, I'm so hangover from yesterday)

2. - Møtte du henne igår? (Did you meet her yesterday)
- Ja, det var så sykt kleint! (Yeah, it was so embarrassing!)
by Shi Xue February 13, 2011
 
5.
German for the word 'small.'
You have a klein brain.
by Kleinhansco February 12, 2010
 
6.
Klein is another name for a douchebag.
"look at that Klein over there yelling at his girlfriend. didn't he cheat on her last week?"
by Kate021010 April 14, 2010
 
7.
n. A pretentious display of superfluous grandiosity.
v. To conspicuously and pretentiously display superfluous grandiosity, especially when socially out of context.
adj. Having the qualities of a pretentious display of superfluous grandiosity.
I'd go on a cruise, but that'd be very klein of me.
by Giant Jerry September 05, 2006