Entry 3 senses · 3 variants Webster, 1913 Bub /bŭb/ · IPA /bɐb/ n. n. v. t. 01 n. Strong malt liquor. 1. Strong malt liquor.[Cant] 02 n. A young brother; a little boy; -- a familiar term of address of a small boy. 1. A young brother; a little boy; -- a familiar term of address of a small boy. 03 v. t. To throw out in bubbles; to bubble. 1. To throw out in bubbles; to bubble.[Obs.]