Peirced nipples in the context of porn video tags refer to nipples that have been pierced, typically with a small metal hoop or ring through each nipple. This type of body modification is often seen as erotic or sensual and can be incorporated into sexual activities or as part of nude or fetish photography. The term "peirced" is used to indicate the presence of these nipple piercings in the content of a porn video, which may appeal to individuals with an interest in this specific type of body modification.