IYDGI

Short for "if you didn't get it", usually used in the context of an extremely hard to find reference or joke. IYDGI is only used when absolutely necessary, as it can potentially ruin the joke.

*Setup* You know who else has dementia?
*Punchline* "A satanical figure that has been cooked and prepared in such a way that it develops a dark brown to black colour and a texture that may be either chewy or crunchy! (IYDGI, demon char)