foolish talk
囈 centers on speech that is nonsensical or foolish: talk that lacks sense or reason.
囈 combines 口 (mouth) with 藝, which likely contributes the sound and may relate to elaborate or excessive speech. The exact historical development is uncertain.
The mouth radical 口 beside the intricate 藝 suggests speech that is overly complicated or tangled, like foolish talk that makes no sense.
For ゲイ, imagine a foolish talker who keeps saying 'gay' in a nonsensical way: 'gay' -> ゲイ, and the mouth keeps babbling.
—
delirious talk; nonsense