Yiddishe[r] kop (אידישער קאפ) means “Jewish head,” and you can use it to refer to someone who has good problem-solving skills or otherwise acts with common sense.
A related term is Gemara kop (גמרא קאפ), which means a “Talmudic head.” Through years of Talmud study, immersed in the Divinely inspired wisdom, the mind is sharpened, and “pretty smart” becomes “brilliant.”
Thus, while the Yiddishe kop may figure out which line in the supermarket is shortest, the Gemara kop shops online (and collects points).
A "Yiddishe kop "r efers to the way of Jewish learning. it is not only having a kop for learning Jewish subjects only , it is also for what Jews have contributed in the sciences and world welfare in general. If you consider only those who study G'mara and Talmud, you might as well be excluding women! Those who are good males that have a special brain and dedication just for that. "Ilium." i would rather argue that a "Yiddish kop " has nothing to do with the subject , but the way of assimilating information that forms a cultivated mind that tends to find solutions for the problems that confront us as humans. The 'Yiiddishe kop' doesn't come out of the blue it is cultivated in the family milieu and the community. Those individuals are problem solver and give of themselves with their knowledge to the community.