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Literally it means "I do not know" in French. But it is actually an euphemism to express a pleasant or desirable trait about something or someone that can't be desribed or explained.

This French idiom is frowned upon by people who feel socially, economically, or mentally threatened because they can't stand "snobs" who use this phrase (see first definition in this list). People who fear foreign languages also have a tendency to have small reproductive organs, carry big guys to compensate for their lack of confidence, and are generally socially inept when trying to carry on an intelligent conversation with people smarter then them.
"There's a certain lack of je ne sais quoi in people who call other people snobs..."
"I don't know about that guy over there, there's definitely no je ne sais quoi in his life."
"That poor unintelligent bastard over there doesn't like people who say je ne sais quoi."
by Mr. Je ne sais quoi September 26, 2013
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Feb 23 Word of the Day
The process of searching a building for an empty bathroom. A successful bowl search typically relieves the frustration of uncomftorably defecating around others, although in less frequent cases the desire to urinate alone is a factor. Bowl searching can be done anywhere although it is most prevelant on college campuses.
"In college I did a lot of bowl searching."

"Sam went to the bathroom like 20 minutes ago. Jeez, what's taking so long?"

"He's probably bowl searching."
by A bowl searcher June 06, 2011
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French: "I do not know what".

As far as english speaking people are concerned, this is spoken by snooty types as to sound more sophisticated than they are, used humorously as such by people who *do* know what it means, and spoken by French when they need to say "I don't know what" in French.

Generally speaking, can be used if you're feeling particularly suave to give an explanation of something of a certain unknown or indescribable quality.

See also unobtanium.
"This house lacks what the French may call a certain je ne sais quoi," said the pretentious rich bastard.
by ke6isf October 03, 2004
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What you say when you don't know what to say, and can't be bothered to say what you think.
You: What does "Je ne sais quoi" mean?
Me: .........Well...... Je ne sais quoi.
by Madkittykat October 07, 2010
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