Green’s Dictionary of Slang

equal shares; also as adv.

1927		(con. WWI) Sat. Eve. Post 5 Mar. 167: Nix. Halvies on what I get [HDAS].
1935		S. Kingsley Dead End Act II: milty: Oh momma! Haffa buck! spit.: (shouting quickly) Akey! Akey! Haffies.
1937		A. Kober Having Wonderful Time (1975) [play script] 135: Wanna go halfies, Chick?
1956		AS 31.37: Halvsies on the candy bar!
1966		R.E. Alter Carny Kill (1993) 56: My ex-wife says to me ‘Help me knock off my hubby and I’ll inherit the bundle and give you halvies.’.
1967		P. Thomas Down These Mean Streets (1970) 103: We’ll pool what we make on commissions and split halfies.
1972		F. Morris Great and Groovy Things to Make 15: If you’re going to go halfies with friends and make lots of things, then you might want to invest in all these things and more.
2003		J. Bohannon Abracadabra, You’re Dead 13: We’ll go halfies on the cab fare. Okay?
2010		Codella and Bennett Alphaville (2011) 330: One of the whiners that bitched [...] about going halvsies on having Gio and me killed.
2012		T. Robinson ‘The Long Count’ in Dirty Words [ebook] Dante offered Rusty the glittering contents in his left hand. ‘Halfsies?’ he offered hopefully.