Green’s Dictionary of Slang

boychick n.

[SE boy + Yid. dimin. -tshik]

affectionate term used to a man, not necessarily young, lit. ‘little boy’.

[US]H. Herschfield Abie the Agent 9 Oct. [synd. strip] I bet he’s buying maybe a new suit with the raise I hendled him lest night — that boychick got a great future.
B. Pearl Sarah & Her Daughter 92: Now and then to intensify her meaning , she had recourse to an English word or broken phrase ‘boychick’ — ‘fadder’ [...] ‘America is a golden land’ [...] The ‘boychick’ being Abie, the son of the man arrested.
[US]C. Odets in Six Plays (1939) 48: jacob: Boychick, wake up! Be something" Make of your life something good.
[US]J. Gaer Our Lives 43: ‘Boychick [...] you want to get us all sick?’.
F. Feikema Brother 249: Mrs. Babbas [...] came to his door and poked her head in and said, ‘A lady to see you , Boychick’.
[US]L. Skir [bk title] Boychick.
[US](con. 1963) L. Berney November Road 136: “Goddamn you, boychick,” Ed said. “You almost gave me a heart attack.
[US]N.M. Jackson et al. Oxford Handbk Jewishness 258: Boychick is the Yiddish term of endearment for Ashkenazi Jewish boys and men. I play with and happily own the notion of being a boychick in both Yiddish and in English.