A fictitious drink used to denote the lesser of two evils. Originally featured in the episode "The City of New York Vs. Homer Simpson", Homer was offered Mountain Dew or Crab Juice. After thoroughly detesting the Mountain Dew, Homer selected the Crab Juice (a flavor most would find detestable).
Brian: Would you rather use MS Office (and support Gate's economic control of the world) or struggle through Open Office to type your paper?
Kelly: I'll take the crab juice. Office seems easier.