"_R_B_U". Hint: Boys use it, Girls like it But parents hate it? answer this puzzle

One of the possible answers to this question is the word, Prabhu. Therefore Prabhu can be the answer.
Prabhu means 'Lord'. This word can be found in many English texts which have got an Indian taste in it. This word is mostly used in India. The orthodox Indian females call their husbands by this sobriquet and also address God by this sobriquet. Women's love towards their husbands is understood as the reason for calling addressing their husbands by the word 'Prabhu'