The Collaborative International Dictionary of English v.0.48:
Bubby \Bub"by\ (b[u^]b"b[y^]), n. [Cf. Prov. G. b["u]bbi, or It. poppa, Pr. popa, OF. poupe, a woman's breast.] A woman's breast. [Low] [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Bubby \Bub"by\, n. [A corruption of brother.] Bub; -- a term of familiar or affectionate address to a small boy. [1913 Webster]