A Knight of the Seven Kingdoms episode 3: What does Eggs song mean?

From "The Bear and the Maiden Fair" to "The Rains of Castamere," the world of Westeros is no stranger to catchy, in-universe songs. In its third episode, A Knight of the Seven Kingdoms gets in on the musical action itself, incorporating two songs into its storyline, including one sung by Egg (Dexter Sol Ansell).

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At first glance, the song is a bawdy...