The pig—we are assuming that rodentine creature is, evidence to the contrary, a pig—is enamored of his naked buttocks. He wants you to admire them, to touch them, and, we fear, to eat them.
Moreover, he is sitting upon the Buck's sign—yes—with his bare bottom. Unhygienic and borderline aggressive, Buck is determined to die. He's just not willing to sacrifice his clothing-optional lifestyle on the road to his wonderful (and wonderfully naked) death.
This is one of the least effective, yet most naked, come-ons we've seen in a while.