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
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Klein, Andy: noun

The guy who sends little black boys over with flowers for me, and is also known for bringing me iced tea.
by bella June 21, 2004
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An old man with nothing better to do than sit home with his old woman and make science tests. He talks like a gameshow host and looks like a retarded horse jockey. Other names for Klein include, captain Klein , commander Klein, and the Kliziner.
by Ralphus April 13, 2004
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(N0) A person who leaves a domicile and doesn't close the door behind them.
Stop being a such Klein you son of a bitch its cold out side.
by andy45247 November 05, 2007
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A bald man who uses careyistc speech and puts down those dummber than himself. Also a man who has nothing to do but make up vocabualry test so he can make puns.
Mr. Klein enjoys silly puns that interupt the learning process.
by Art Garfunkel July 07, 2004
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Verb: Named after a particularily racist and bigoted user on the imdb forums. This refers to the practice of composing a single long,post and then using cut-paste to spam the boards with it without provocation. This can involve a month-old post or a new one, but it is generally used when the person in question keeps posting the same ramble over and over again, instead of using actual language.

Also called Kleining
"Would you please stop kleining all over the place? Post something different."
by Falcon2 August 14, 2005
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Klein is a independent school district in south texas. it includes schools like Brill, Krahn, Kleb, Klein High, and much more. it is a very modern school district. Klein is also a city in south texas.
hey, what district is Krahn in?” “Oh, just the best. Klein!
by liltrashygirl93 January 31, 2018
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