A nude picture, usually sent via text message, of someone you really don't want to see naked. Usually the person sending these messages is oblivious and just sends them for the hell of it.
Orin told me I've got a tater coming today, I need to watch my phone like a hawk so I can delete it in time.
Used almost exclusively with the phrase "Taking it in the tater" or "Took it in the tater" meaning to get screwedliterally in the butt or screwed over figuratively.