JOHN Meaning of JOHN in English john /dʒɒn $ dʒɑːn/ BrE AmE noun [countable] American English informal [ Date: 1900-2000 ; Origin: John , male name ] 1 . a toilet 2 . the customer of a ↑ prostitute Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012