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.

Using a wall hack in an online game. Almost always illegal and will get the player banned from the server.

A form of torture used by the USA. The tortured person is slammed against a wall.

To have sex standing up.

walling is related to facebook walls. when there is a person that you have a romantic interest for you

wall, meaning that you are always on their facebook seeing exactly what they are doing, it is a lighter term for facebook stalking; derived from punching the wall, or asking someone out also, therefore, you are the puncher, (the one who asks out) and your crush is the wall(the one you ask out.)

Posing on a wall