This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 毄 is uncertain. It visually contains 軎 and 殳, but the original semantic and phonetic roles of these components are unclear.
The left side looks like a wheeled vehicle (車-like) and the right side is a hand holding a weapon (殳). Imagine a chariot striking something, but since the meaning is uncertain, treat this as a visual placeholder.
For ケキ, imagine a chariot wheel making a sharp 'keki' sound as it strikes a target: keki -> ケキ.