/ Dictionary / Index S sissy bar: Meaning and Definition of Find definitions for: sis'sy bar" Pronunciation: [key] a tall, looplike frame fitted to the rear of a bicycle or motorcycle saddle, functioning chiefly as a backrest. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sissy sister Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language