Blood urea nitrogen, among many other things.
This means they want their burger on a bun.
Buttocks
in Acronym Finder in Acronym Finder
The acronym may mean "by us for us" and may be a misstatement of the acronym FUBU.
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"bun"
I have no idea what you mean by this question.
That is not an acronym in any of the Acronym Dictionaries.
As an acronym:
Its a term of endearment.
kidney function
The acronym AQR means Ain't Quite Right.