/ Dictionary / Index T thunder mug: Meaning and Definition of Find definitions for: thun'der mug" Pronunciation: [key] — Older Slang. Older Slang. a chamber pot. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thundering thunderous Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language