Green’s Dictionary of Slang

bordens n.

[the firm Borden’s, producers of milk and dairy products; elsie presumably refers to a ‘typical’ name for a cow]

(US) the female breasts; also ext. as borden’s and elsie’s, borden and bowman; one of many sl. terms for breasts relating to their role as milk-giving.

Show quotations
‘Gypsy Rose Lee’ G-String 85: Get a load of those Bordens.
[US]in DARE I 341/1: (A woman’s breasts) [...] Borden’s and Elsie’s.
[US]L. Pederson ‘Urban Word Geog.’ AS XLVI:1/2 82: Breasts [...] Borden and Bowman.