From Longman Dictionary of Contemporary Englishlocolo‧co /ˈləʊkəʊ $ ˈloʊkoʊ/ adjective American English informal CRAZYcrazy → in loco parentis
Examples from the Corpus
loco• But Lazio's fanatical support will go loco if he can open his Serie A account.Origin loco (1800-1900) Spanish 