This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
餴 combines the food radical 飠 with 奔, which likely contributes a phonetic element. The exact historical development is uncertain.
The food radical 飠 suggests something related to eating or food, but the overall meaning is unclear. Picture a rare dish that only appears in old texts, its recipe lost.
For フン, imagine a cook having fun experimenting with an unknown food ingredient: fun -> フン, tied to the food radical 飠.