The Kayapo people are the indigenous people in Brazil who inhabit a vast area spreading across the states of Pará and Mato Grosso, south of the Amazon River and along the Xingu River and its tributaries. This pattern has given rise to the nickname the Xingu tribe. They are one of the various subgroups of the great Mebêngôkre nation. The term "Kayapo" is used by neighbouring groups rather than the Kayapo themselves. They refer to outsiders as "Poanjos".

The lip plate, also known as a lip plug, lip disc, or mouth plate, is a form of body modification. Increasingly large discs are inserted into a pierced hole in either the upper or lower lip, or both, thereby stretching it. The term labret denotes all kinds of pierced-lip ornaments, including plates and plugs.