‘Argy-bargy’ and its slightly older variant ‘argle-bargle’ have been a part of British English since the second half of the 19th century. ‘Argy’ and ‘argle’ evolved in certain English and Scottish dialects as variant forms of ‘argue.’ As far as we can tell, ‘bargy’ and ‘bargle’ never existed as independent words; they only came to life with the compounds as singsong doublings of ‘argy’ and ‘argle.’