* It's a misspelling: There may be a similar phrase you're trying to remember. Try checking for typos or alternative spellings.
* It's a specific term: Perhaps it's a technical term or jargon within a specific field. Could you provide more context about where you encountered this phrase?
* It's a made-up phrase: It's possible it's a fictional phrase or slang.
Please provide more information so I can help you understand the meaning of "Kasten sie."