When someone phones you up, then hangs up, so you have to call them back using your own credit/money.

Of or relating to Jews or their culture or religion.

The extension of ones Judaism, by per taking in actions that are extra Jewish.

Jewish means belonging to the Jewish faith or religion. Jewish, for some, means going out for Chinese food on Christmas Eve.
Jewish people, historically were denied entry into many professions and guilds and were forced to be money lenders, hence the stereotype of Jews and money.
Many Jews, but not all Jews invest heavily in education. Hence, a wise person is an informed person and can learn to read and analyze stocks. There's no special magic to learning to make an investment. Read a book, dude!

(not JEW-ish) adjective. the catch all phrase used between Yids to classify someone who is Catholic, Protestant, Baptist, Methodist, Athiest, Muslim, etc.

a person who believes in Judaism/relating to the Jews

A racist way of saying, "that's cheap. Mainly used among adolescent teens on online games.