An insanely useful way of detecting the presence of another Jew in the near vicinity mainly by looks or auditory sample. You are one lucky bastard if you posess this and are not in fact a Jew yourself.
Randomness #1: Hey, is that guy-?
"Guy": SHALOM!
Randomness #2: Hella yeah.
by Chezlea March 14, 2004
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The innate ability to detect Jewishness in another person. Like a sixth sense.
"Yo check out the guy with the pigtails and yammulke. Jewdar off the charts."
"Oh you mean Jedediah over there? No, he's Presbyterian, obviously, bitch."

Some guy: "Shalom baby, 'jew' lookin' mighty fine tonight."
Girl: "What!!?!? I'm not Jewish, motherfucker. I'm Hindu. Nice jewdar."
Some guy: "Oh, sorry, I didn't see that red dot on your head. And that kimono or whatever it is. Oh yeah, and I guess you do look sort of Indian too. So, how 'bout you take me back to the reservation with you? You can be Pocahontas and I'll be the John Smith. Then we can bang."
(gets bitch-slapped)
by Nick D November 21, 2003
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the innate ability to find currency and save it as though it was a small child.
His jewdar lead him straight to the money laying on the ground at the bar that no one else had even noticed.
by flutterby123 April 7, 2011
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The special power posessed only by Jews that enables them to identify Jews by looks or, at most, hearing them speak. It is imporant to note that non-Jews do not and cannot have this power, as many of them naively believe that all Jews are fair-skinned with huge noses and jew-fros. Only some of us are, shmucks.
You'd be surprised at how many Jews come in here.... my jewdar is off the charts.
by Jonathan January 18, 2004
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An ability to find the best bargains anywhere in the shopping vicinity. Based on the stereotypical, yet often held true by Jews, belief that Jews are cheap.
"Hey! My Jewdar is going off! This way to the dollar store!"
by jewcygirl March 18, 2006
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An innate or learned ability to detect and prevent an unfortunate situation, generally of a financial nature and in a dealing with a Jew, where one would be subjected to a bad deal, agreement, theft, or other form of loss.
Can you believe that kike was trying to pass that Rollex clone off as the real thing? He was even asking $1,000 for it. It is a good thing that my jewdar was working.
by Alpha Aquarius October 7, 2008
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a nonexistent ability that people claim to have. such people believe they can "sense" a Jew. obviously this is impossible unless the Jew has the distinctive hairstyle of the Orthodox sect or is wearing a yarmulke, since Jews aren't another race and look just like everyone else.
some guy: according to my jewdar, you're Jewish.
me: yeah, and the fact that I'm wearing a star of david had nothing to do with it. shmuck.
by Shwaggy January 15, 2004
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