Definition of "shonicker"

“Well, if you ask me, Barney is a combination of eight ball, mick, and shonicker,” said McArdle, one of the corner topers.

1932, James T. Farrell, chapter 6, in Young Lonigan, section 3, page 156

“You and I are expendable here, Charlie,” Humboldt said. “Why? I'll tell you. We're Jews, shonickers, kikes. Here in Princeton, we're no threat to Sewell.”

1975, Saul Bellow, Humboldt’s Gift, New York, N.Y.: Viking Press, page 124

He'd cried out, in the last scrap, urging Benny to demolish a Jew, ‘Hit him, he's only a shonicker.’

1979, James Wreford Watson, quoting James T. Farrell, “The Jewish Scapegoat”, in Social geography of the United States, Longman, page 92