Green’s Dictionary of Slang

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

1914		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.
1920		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.
1935		C. Odets in Six Plays (1939) 48: jacob: Boychick, wake up! Be something" Make of your life something good.
1948		J. Gaer Our Lives 43: ‘Boychick [...] you want to get us all sick?’.
1950		F. Feikema Brother 249: Mrs. Babbas [...] came to his door and poked her head in and said, ‘A lady to see you , Boychick’.
1971		L. Skir [bk title] Boychick.
2018		(con. 1963) L. Berney November Road 136: “Goddamn you, boychick,” Ed said. “You almost gave me a heart attack.
2021		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.