in-joke
- n a joke that is appreciated only by members of some particular group of people
- It started as an in-joke among feline-friendly bloggers: why not post pictures of their cats every Friday afternoon? Friday catblogging became a hit, and soon even NASA was playing .
- Calling the first one easy is an in-joke: it is easy in the sense that curing cancer or sending someone to Mars is easy.
- The self-referential, language-besotted, in-joke-packed love child of The Simpsons and Christopher Guest movies, AD never forgot the needy human core in its family of freakstoxic .