Gay as a

Meaning of “Gay as a maypole” This phrase can be explained in multiple ways. Maypole is a tall pole that is erected on celebrations of May Day in many European countries. So Henry’s phrase could express the happiness that comes with the celebration of May Day.
Gay is a term that primarily refers to a homosexual person or the trait of being homosexual. The term originally meant 'carefree', 'cheerful', or 'bright and showy'. [1] While scant usage referring to male homosexuality dates to the late 19th century, that meaning became increasingly common by the midth century. [2].