Green’s Dictionary of Slang

chippie adj.

[chippie n.2 (2)]

(US) innocent, novice.

[US]Sat Eve. Post 1 July 3: [of a novice railroad engineer] What’ll she do to this chippy runner [HDAS].
[US]J. Black You Can’t Win (2000) 94: Didn’t him and Smiler bring it up here to me for my end of that chippy gambling house’s bankroll.