Entry 2 senses · 2 variants Webster, 1913 mama's boy · IPA n. n. 01 n. Same as mamma's boy. 1. Same as mamma's boy. See: mamma's boy 02 n. A boy excessively attached to his mother; a boy lacking the usual masculine interests; also spelled mamma's boy. 1. A boy excessively attached to his mother; a boy lacking the usual masculine interests; also spelled mamma's boy. Syn. mother's boy.