A letterbox without a home. A hitchhiker is hidden with another letterbox, and the person that finds it is expected to take the hitchhiker to another letterbox. For more hitchhiker discussions, visit our Hitchhikers board.
a television or radio commercial, placed at the end of a program, that features a product not advertised earlier in the program by an advertiser who previously promoted another of its products in the program; usage may denote any local commercial that is inserted in a national program. Often referred to as a drop-in ad. Sometimes refers to promotional material added to a direct mailing sent to consumers for another purpose. See ride-along and statement stuffer.
a letterbox that is placed in another letterbox, and is moved from box to box as it is found