Language is a social space, an aesthetic, a form of play and communication, a geographical reference, a jouissance, a producer of numerous social and personal identities. This book takes up salient issues of sociolinguistics with a specific focus on Japan: language and gender (the married name controversy), language and the 'portable' identities being fashioned around traditional, essentialist notions of ethnicity (metroethnicity) endangerment, slang, taboo and discriminatory language in Japanese especially regarding minorities, place-names from indigenous languages, the fellowship and parody of children's songs, and the diversity of nicknames among children and young people. This books gives radical and new perspectives on the sociolinguistics of Japanese.