WordReference Random House Unabridged Dictionary of American English © 2026
rum-dum
(rum′dum′),USA pronunciation [Slang.]
n.
adj.Also, rum′-dumb′, rum′-dumm′.
n.
- Slang Termsa stupid or ignorant person.
- Slang Termsdrunkard;
lush.
adj.
- Slang Termsstupid;
ignorant. - Slang Termsof, pertaining to, characteristic of, or arising from habitual drunkenness;
addled by drink.
- rhyming compound with rum1 and dumb, perh. influenced in sense by humdrum 1890–95