If only I had a neck

[Swellin]

Am I the only person who has NO idea what that means?

Redneck thing I guess.

Female deer go into "season" once a year. When they are ready for breeding, the males go nuts. They start producing a very strong odor and become very territorial. Their necks swell up in size during this period.

Hence, "like a buck (male deer) in rut."