Refers to simple or rudimentary pictures (drawings, paintings, etc) of people. They're called "matchstick men" because their limbs are made of simple lines, or matchsticks.
Con artists are also referred to as matchstick men because they create temporary personas that are fleeting and simple.
Dude, don't give that guy any money. His story doesn't add up. He's totally just a matchstick man.
Many a L. S. Lowry painting includes a matchstick man.
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