This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
慠 combines 忄 (heart/mind) with 敖, which likely contributes the sound. The exact historical development is uncertain.
The heart radical 忄 beside 敖 suggests an emotional state, but the specific meaning is unclear.
For ゴウ, imagine a proud person named Go who feels an uncertain emotion: Go -> ゴウ, and his heart 忄 is involved.