LONG JOHNS Meaning of LONG JOHNS in English long johns /ˈlɒŋ dʒɒnz $ ˈlɒːŋ dʒɑːnz/ BrE AmE noun [plural] [ Date: 1900-2000 ; Origin: From the male name John ] warm underwear with long legs Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012