This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
嚱 combines 口 (mouth) with 戲, which likely contributes sound. The exact historical development is uncertain.
With 口 (mouth) beside 戲, imagine a mouth making a playful or dramatic sound, but the exact meaning is unclear.
For キ, picture a key (キー) being used to unlock a mysterious sound from the mouth: key -> キ.