Guts

Guts has a number of meanings, both as a regular word and as an acronym:

Vernacular

• Guts, a common term for the gastrointestinal tract, especially the intestines (by contrast, the singular "gut" usually refers to the stomach or more commonly to the fleshy and fatty belly that covers the lower abdomen).
• Guts, a colloquialism for courage or (less approvingly) for chutzpah, as in "that took a lot of guts"; adjective form "gutsy", as in "that was a gutsy move"
• To "spill one's guts", a slang phrase meaning "to reveal information best kept to oneself, such as under interrogation or threat or for monetary reward; to snitch"

Sports and games

• Guts, a team flying disc game, similar to dodgeball
• Guts, a poker variant.

Science and medicine

• GUT, general term for any of several grand unification theories in physics.
• GUTS, shorthand for the Growing Up Today Study, a Harvard University child development research report

See also "guts" as an anatomical colloquialism, under "Vernacular", above.

Books, films, TV, music, games and other media

• Guts (book), a management guide book by Robert A. Lutz, former CEO of Chrysler.
• "Guts", a short story by Chuck Palahniuk that appears in his book Haunted
• GUTS, a weekly half-hour sports game show which aired on Nickelodeon from 1992 to 1995.
• "Guts", nickname of the main character of the anime and manga titled Berserk.
• Guts, an obtainable character "skill" in the Super Nintendo videogame EarthBound, and the PlayStation games Star Ocean: The Second Story and Valkyrie Profile: Lenneth
• "Guts", a song by Welsh musician John Cale
• GUTS, an acronym for the Groningen University Theatre Society