Definition of brother exclamation from the Oxford Advanced Learner's Dictionary

 

brother

 exclamation
exclamation
BrE BrE//ˈbrʌðə(r)//
 
; NAmE NAmE//ˈbrʌðər//
 
 
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(old-fashioned, especially North American English) used to express the fact that you are annoyed or surprised Oh brother! Word Origin Old English brōthor, of Germanic origin; related to Dutch broeder and German Bruder, from an Indo-European root shared by Latin frater.
See the Oxford Advanced American Dictionary entry: brother