my friend that took the class with me didn't really grow up around jewish people. he would jokingly refer to anything mildly jewish as "kosher" the same way that suburban white kids refer to anything mildly black as "ghetto"

In the class, we were learning about Duke Ellington's band, and he had a trombone player named Joe "Tricky Sam" Nanton. We asked how come he was called Tricky Sam if his name was Joe. Professor said "well.... he was pretty damn tricky!"

Extending that logic, my friend started calling me KosherSam, and I kinda ran with it.