I do what I do

expression explaining that is how they do things and shouldn't be questioned any further

example 1:
person 1- hey why are you always getting into fights when we go out

person 2- hey i do what i do

person 1- ah of course

example 2:

person 1- were you really hitting on that chick last night

person 2- i do what i do

person 1- gotcha

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