When you are being cheap without knowing it (it's used to warn people that they are doing something cheap/jewish). Usually used with Jewish people.
Man1: Would you please spare a dime for children in need?
Man2: Umm...I don't think I can do that(walks away)
Man3(to Man2): Wow you couldn't spare a dime? Your jew is showing.
Man2: Umm...I don't think I can do that(walks away)
Man3(to Man2): Wow you couldn't spare a dime? Your jew is showing.
by goldinismyname December 8, 2010