This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
笩 combines 竹 (bamboo) with 代, but the historical origin and original meaning are uncertain. It may have been a variant or a character used in proper names.
The top 竹 suggests bamboo, and the bottom 代 suggests substitution or generation. One could imagine a bamboo object passed down through generations, but the true meaning is unknown.
For ハイ, picture a bamboo pole being used to wave a high flag: high -> ハイ, though the connection is loose.