The condition of someone being so fat, that the horizontal fat rolls on the back of their neck stack up, resembling a package of hot dogs.
Damn, bitch, get off my tip! I don't fuck bitches with hot dog neck...unless, of course, I'm hoggin'.
That guy just ordered 4 Arby's Melt's, a large curly fry, potato pancakes, an apple turnover , a large Jamocha shake, and a diet. No wonder he's got hot dog neck.