Well, considering the circumstance, the speaker seems to be in an informal and exclamatory mood, so it is understandable that he/she would use a slightly less polite way to ask someone to move. That said, you could say:
Hey! Watch out! Move out the way! Hey! Watch out! Get out the way!
No matter what, the speech sounds informal, so politely asking the person to please excuse themself would sound silly.
I agree with mtmjr (user). It seems like the person really needs to get out of the way to avoid danger. So in those situations we don't want to say "Please" or things like that we want the other person to get the message as mtmjr has mentioned. It sounds like the person knows the other person because he/she said it very informally!
If a situation involves immediate danger, there is little reason to attempt to be polite to begin with, roxcyn. However, NamLan did not provide any specific context. His request as, in fact, for politer, idiomatic versions.