For example, the common bath toy, known as the "Rubber duck" can be made into "I'll rubber your duck" Which implies smothering and impaling a duck with rubber. However, when "If you know what I mean " is added afterward, it implies that it is something sexual, thus making it extremely funny and smart-sounding. However, it is up to you to discover what "Rubber" and "duck" represent. (God, You and your sick, erotic fantasies!)