know the score

as you know

as it is already known.

even the score

To seek or obtain revenge against someone.

four score and seven years ago

Used (sometimes sarcastically) to indicate that a past event being mentioned is particularly important: a long time ago; many years ago.

fuck if I know

I have no idea whatsoever

go off at score

To break suddenly into a gallop.

hell if I know

Synonym of I don't know.

I don't know about that

I am not sure that I agree; expressing doubt or skepticism.

I hardly know her

A joking retort that draws attention to the possibility of sexual innuendo when a word ends with a schwar.