Genitals mostly involved as point of joke

• Trailer phrase
• Identifying phrase
• "One man's struggle to take it easy," for "Ferris Bueller"
• "Just when you thought it was safe to go back in the water," e.g
• Slogan putting liberal in a stew
• Something funny in setting of gelatin
• "Good night, and good luck," e.g.
• "Just do it" for Nike
• Quotable bit on a movie poster

Wikipedia Word definitions in Wikipedia
In entertainment , a tagline (alternatively spelled tag line ) is a short text which serves to clarify a thought for, or is designed with a form of, dramatic effect . Many tagline slogans are reiterated phrases associated with an individual , social group ...