The unexpected disclosure of a person's Jewishness in, or creating, an extremely awkward or combustible situation.
In his autobiography The Ragman's Son, Kirk Douglas (nee Issur Danielovich) recounts many instances of confronting anti-Semitism he encounters by people unaware the actor himself is Jewish. In a particularly notable example, Douglas explodes a Mazeltov Cocktail in the face of an anti-semitic actress immediately after bedding her, remarking at the climactic moment, "I am a Jew...You are being f...d by a Jew."
by PBCHLS92 February 21, 2012
When a Jewish man jizzes into his Bar Mitzvah yamaka and then proceeds to spit in it. The yamaka is then furiously tossed into the face of his partner.
by BlueBoobies96 March 16, 2016