Ma Libs (a play on ad lib, from Latin ad libitum - as you wish) is a word game where one player prompts another for a list of words to substitute for blanks in a story; these word substitutions have a humorous effect when the resulting story is then read aloud. The game is especially popular with American children and is frequently played as a party game or as a pastime. Many teenagers like to substitute clean words with profanity, racial slurs, and sexual innuendo.