Means more or less idiot but in a loving way. You usually say that to your best friend or a better friend. This word is more often used in the area of the austrian alps.
When a jew avoids an important obligation on Saturday because it is the sabbath. He or she is "Pulling a Koufax".
-Making reference to the great Jewish baseball pitcher Sandy Koufax who had to miss a world series game because it was a high holy day, and put his team in jeopardy of losing.
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