bub /bʌb/noun 7verb 1forms 3 noun7 •A term of familiar address; bubba; bubby.So he changed his brusque manner, and inquired, in a tone which was intended to be extremely conciliatory : ‘ What′s your name, bub ? ’ ‘ The last one, Sir ? ’ asked bub, looking up. — 1857 •A young brother; a little boy; a familiar term of address for a small boy. •(slang) Clipping of bubbly; champagne.You find me in da club, bottle full of bub — 2003 •(Australia, slang) A baby. •(slang) A woman's breast.‘Mr. Blanford, I esteem that there is nothing more sublime in nature than a glimpse of an English lady's bubs.’ — 1982 •Clipping of bubble. •(slang) An alcoholic malt liquor, especially beer."You can't remember your *name*? Heh. Well, NEXT time you spend a night in this berg, go easy on the bub." — 1999 verb1 •(no longer used) To throw out in bubbles; to bubble.We passed on so far forth till we saw Rude Acheron, a loathsome lake to tell, That boils and bubs up swelth as black as hell — 1563 formsbubbed · bubbing · bubs