Texts Written On Buttocks Clothing

In ancient astrology, various parts of the body were associated with signs of the zodiac - e.g. the buttocks to Libra (The Balance). Depending on the context, exposure of the buttocks in non-intimate situations often causes feelings of shame, embarrassment or humiliation in a non-exhibitionist subject, and embarrassment or amusement in a non-voyeurist audience (pantsing). Expressions such as being caught with one's pants/ trousers down or more explicitly in Dutch, "met de billen bloot" ("with bared buttocks"), use the image as a metaphor for non-physical embarrassment as well.
Willfully exposing one's own bare buttocks as a protest, a provocation, or just for fun is called mooning.
A wedgie is pulling someone's undergarments or swimming trunks up through their buttock crack to be hauled over the top of the victim's trousers, sometimes partially baring the victim's buttocks.
It is no coincidence that the English verb to spank is the only one specifically meant for physical discipline of a specific part of the body, and various other languages have terms specifically referring to spanking; in many punitive traditions, the buttocks are the preferential target for painful lessons, from educational to judicial, as offering them for punishment (especially uncovered) adds a psychological dose of embarrassment and even sexual humiliation to the pain, which can be meted out with less risk of long term physical harm than elsewhere. There are, in various cultural traditions, expressions like "seat of learning" which refer to the preferential paining of the posterior in a submissively bent and exposed position.