You want this trope's definition? You can't handle this trope's definition!
We've all heard this phrase used a million times in a million different ways. Sometimes it's the exact phrase, but more often than not the writer will twist it in some way, just a bit, to impart a little comedy while not compromising the actual quote - like replacing "truth" with "tooth". Or maybe "parody".
The phrase itself comes from the famous rant by Jack Nicholson's character at the end of A Few Good Men. Thanks to Pop-Cultural Osmosis, and particularly this trope, this phrase has become more well known than the actual movie (which is by no means an "unknown" film, nor an unmemorable one).
