Entry 3 senses · 2 variants Webster, 1913 Slubber · Slub·ber · IPA /ˈslʌbɚ/ v. t. n. 01 v. t. To do lazily, imperfectly, or coarsely. imp. & p. p. Slubbered; p. pr. & vb. n. Slubbering 1. To do lazily, imperfectly, or coarsely. “Slubber not business for my sake.” — Shak. 2. To daub; to stain; to cover carelessly. “There is no art that hath more . . . slubbered with aphorisming pedantry than the art of policy.” — Milton. 02 n. A slubbing machine. 1. A slubbing machine.