“Jabberwocky” is the title of a poem full of nonsense words in “Through the Looking-Glass,” Lewis Carroll’s 1871 sequel to “Alice in Wonderland.” The poem is full of fantastical language, including “bandersnatch,” “frumious,” “mimsy,” and “snicker-snack.” Some words (such as “chortle,” meaning “chuckle,” and “galumphing,” meaning “moving in a clumsy, ponderous, or noisy manner”) became so popular that they gained the status of “real” words in the dictionary. “Jabberwocky” itself became one of those real words — it’s a noun, designating any type of made-up language or nonsense words, but it also can be used as an adjective to describe something meaningless or senseless.