It's American slang for "Do you understand?" and it probably comes from Italian immigrates who moved to New York City and then learned English as a second language.
2014年7月13日
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Capishe?-Ые понимаете?
A short way of asking, 'Do you understand?'
2014年8月6日
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"What does _______ mean?" is the proper way to ask questions like this.