Idiom Definition:
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"to be gay"
to be homosexual
Synonyms:
attraction, homo-erotic, homophile, homosexual, lesbian, love, relationship, same, sapphic, sex
This mime is literally happy and
gay. - - - - ->

From Wikipedia

This is the literal translation.
The term
gay was originally used to refer to feelings of being "carefree", "happy", or "bright and showy"; it had also come to acquire some connotations of "immorality" as early as 1637.