Green’s Dictionary of Slang

(US) free.

1942		PM 5 Jan. 24: Concerteers like a cuffo concert once in a while [W&F].
1946		E. Wilson It Happened Last Night 31 Jan. [synd. col.] Cuffo Notes: Frank Sinatra, the candor kid, fluffed on a radio program [etc].
1951		Green & Laurie Show Biz from Vaude to Video 568: Cuffo – on the cuff; for free.