A Walmart Photographer is a person who buys a beginner DSLR camera (Canon, Nikon, Sony, etc...) from Walmart, Best Buy, Amazon, etc... and calls themselves a professional photographer with the lack of talent.
Karen: DM me for photography rates!
A hobbyist: Where did you your camera?
Karen: Oh, from walmart! It's a Canon t3i (a beginner camera)
A hobbyist: "Fucking Karen thinks she's a professional cuz she has a camera! She's a god damn walmart photographer!"