never dip your pen into the company's ink

never dip your pen into the company's ink

vulgar slang Do not have a romantic or sexual relationship with someone you work with. "Pen" is a reference to one's penis. Do you really think it's a good idea to date your boss? I'm a big believer that you should never dip your pen into the company's ink.
See also: dip, ink, never, pen
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