00 buckshot, as in 'two donuts (o's) of venison (buck)'. Used as a warning to people you don't want around, like exes. If they were expecting a meal and hospitality they'd better expect to be eating two venison donuts instead. Could also be used if someone "ate two venison donuts" to mean they took themselves out, although using it that way is pretty disrespectful.
The only thing a guest can expect to eat if they end up on Harold's property is a meal of two venison donuts.