Haitian happiness n. severe diarrhea or dysentery. Editorial Note: Many other terms for diarrhea are constructed with quickstep or (the) trots, such green-apple trots or Saigon quickstep, according to the Historical Dictionary of American Slang. Others include Montezuma’s revenge, the screamers, and the shits. (source: Double-Tongued Dictionary)
Further reading
The word filibuster has a long and colorful history, going back to the days when pirates roamed the high seas. Today it refers to hijacking a piece of legislation. Plus, the language of yoga teachers: When doing a guided meditation, you may hear...
The slang term 4-55 air conditioning is means cooling a car by driving fast with all the windows down. This is part of a complete episode.
Related
Another slang for Haitian Happiness, the shits etc, is Hershy Squirts. You forgot the best one of all! Someone has to add it to the editor’s notes.