i heard it in a musical and the full sentence was "Keep it up, get a fist in your face". can anyone explain this to me? Thanks a lot!!!
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First off, "a fist in your face" means "a punch in the face".
"Keep it up" means "Continue doing that".
The syntax is a form of the conditional, like "If x, then y".
(If you) keep doing that, (the consequence will be, you) get a fist in your face.
It is a threat (or a warning).