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1.
A figurative card used by Jews to guilt people/get out of a situation.
David: Ms. Stewart, I can't take the test tomorrow because --

Ms. Stewart: (Sighs) Lemme guess. You have ANOTHER Jewish holiday this week?

David: Actually, no. I'm just going on a vacation to Florida. I'm not using my Jew Card this time...
by hipsterjew October 31, 2010
 
2.
To lead someone on and then crush their romantic dreams because they aren't Jewish.
Boy: I like you
Girl: Ok. I like you too.
Boy: You aren't Jewish so it won't work
Girl: You just Jew Carded me.
by Blasian_Invasion November 15, 2010