The line of grooves that are cut into the side of highways which cause a loud noise when a driver gets too close to the edge.

Mercury retrograde is the act of taking a shit whilst mooning one or more human beings. Your day can typically being going well, according to your horoscope, until you are forced into witnessing Mercury retrograde. Performing Mercury retrograde will often speed the astrological cycle forward for the individual performing the Mercury retrograde, bringing about happy and fruitful times to come.

A strip of grooved pavement along the side of the highway, consisting of a pattern of indentations in the pavement. Makes a loud rumbling noise when driven upon. Designed as a safety device to alert drivers when they are about to go off the side of the road. Looks something like this:
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Textured for sexual pleasure

The counterpart of motorboating on men, where the mouth is used to send vibrations between the penis and the balls (i.e. the scrotal region).

The area on a woman between the thigh and labia that is prone to chafing in hot weather.

Slang term for asshole due to the corresponding ribbing and puckering that both assholes and highway rumble strips retain.