hipped on

Harper Leeの "To Kill a Mockingbird" を読んでいます。
"No, lemme finish--it does, but we're still different somehow. Attcus said one time the reason Aunty's so hipped on the family is because all we've got's background and not a dime to our names."

"hipped" を辞書で調べます。
・Collins Dictionary: US, Informal having a great, often excessive, interest; obsessed:(with on) hipped on movies
・Random House Unabridged Dictionary: greatly interested or preoccupied, almost to an irrational extent; obsessed (usually fol. by on): He's hipped on learning to play the tuba.

初めて見る表現と思いましたが、大分前に（11/4/2010）取り上げていました。