(US/W.I.) a best friend.
|Farm (1968) 170: All the acey-doosies and heavytalkers.|
|Prison Sl. 38: Ace-Deuce also Acey-Deucey Old prison expressions used to signify best friends.|
|(con. 1975–6) Steel Toes 109: So do your ace deuce, cross-eyed road dog a favor, keep a low profile with your city ways.|