It's a common usage in American English to ask where the meat is when speaking either specifically or generally, e.g.,
1. You're assigned by the head of the household to cook the meat for dinner. When it comes time to cook, you ask, "Where is the meat?"
2. You go to a supermarket you've never been to before, and you're in a hurry because you're supposed to cook the meat tonight. You approach an employee and ask, "Where is the meat?", which means "Where is the meat department in this gigantic store?"
You'd always use "the meat", not "meat" without the article.
"Where do I find meat?" is so over-broad and vague, it is unacceptable English, either formal or colloquial.