This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
獩 combines the beast radical 犭 with the phonetic component 歲. The exact historical meaning is uncertain, but it likely referred to a type of animal or a tribal name in ancient Chinese texts.
With no clear meaning, picture a mysterious beast 犭 from an ancient era 歲, its true nature lost to time.
For ワイ, imagine asking 'Why?' (ワイ) when you encounter this obscure beast 獩, because its meaning is so puzzling.