Self-referential humor
Self-referential humor is a type of humor in which a comical statement or action (for example, a joke), often directed at or intended for something else, in effect applies to itself. This type of humor often uses hypocrisy, oxymoron, or paradox to create a contradictory or otherwise absurd situation that is humorous to the audience.
Self-referential humor is sometimes combined with breaking the fourth wall to explicitly make the reference directly to the audience, or make self-reference to an element of the medium that the characters shouldn't be aware of.
Example
RAS syndrome refers to the redundant use of one or more of the words that make up an acronym or initialism with the abbreviation itself, thus in effect repeating one or more words. However, "RAS" stands for Redundant Acronym Syndrome; therefore, the full phrase yields "Redundant Acronym Syndrome syndrome" and is self-referencing in a comical manner.