/ Dictionary / Index S shackup: Meaning and Definition of Find definitions for: shack•up Pronunciation: (shak'up"), [key] — n. Slang. an instance of shacking up: The census people counted both marriages and shackups. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. shack-tapping shacky Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language