P12:a

Etymology 1
Literally, "P12er," from sports age groups often being called P (for ) or F (for ), followed by age.

Noun

 * 1) a member of a P12 sports age group (a boy who turns twelve during the current year)
 * 2)  a twelve-year-old boy (or possibly girl) generally
 * 3)  someone acting immaturely (regardless of age, possibly also of a female)

Usage notes
Chiefly used by adolescents.

Etymology 2
Literally, "P12er," from "paragraf 12" (paragraph 12), from section 12 of the Care of Young Persons (Special Provisions) Act (1990:52) stipulating the existence of special residential homes for young people with psychosocial problems (särskilda ungdomshem).

Noun

 * 1)  a special residential home for young people with psychosocial problems (like substance abuse or criminal behavior), where compulsory care is provided
 * 2)  a person currently or previously treated at such a facility
 * 1)  a person currently or previously treated at such a facility