What is the meaning of they had me for a fall guy. i saw this

Definition of they had me for a fall guy. i saw this sentence in a movie what does it mean? I don't even know that one. You most likely are done learning if you see phrases like that, since you are too good. Or, if you aren't fluent yet, I think you should learn more simple stuff. /:|Mhm. It is very high level phrase /:|Yes, but I can't understand it out of context|Most likely. What movie is it?|Please answer a while from now since it's midnight for me right now.

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