打醬油

Etymology
Popular Internet meme popularised in 2008 by a man-on-the-street's response to a television reporter's question about a recent celebrity photo scandal, to which the man replied, "What's it got to do with me? I'm here to buy soy sauce."

Verb

 * 1)  to be none of one's own business; to not involve one

Usage notes

 * Usually used to express one's reluctance to discuss sensitive issues, sometimes in a jocular or sarcastic fashion.