Entry 2 senses · 2 variants Webster, 1913 Bubby /(bŭb"by̆)/ · Bub·by · IPA /ˈbʊbi/ n. n. 01 n. A woman's breast. 1. A woman's breast.[Low] 02 n. Bub; -- a term of familiar or affectionate address to a small boy. 1. Bub; -- a term of familiar or affectionate address to a small boy.