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1.
A person who is left with the blame for a crime, regardless of whether they were involved or not. Generally a lowly mob member who has to take the blame to protect their boss. Used in Film Noir book and movies.
Mugsy was the fall guy for the murder, and received a big payout when he got out of jail.
by The Kuvasz October 27, 2007
 
2.
The one who is to blame for what goes wrong
Jim is the fallguy for that project.
by Jay Urbanski March 28, 2005