To call claim is to express your belief that an exclamation is untrue. The act of calling claim is a challenge to the person to go through with the action, often one that is very ambitious or daring. The expression is often used to make a person publicly back down or bring light to the ambitious statement made.
Scott: Dude, am i fat?
Scott: I'm going to come back from summer so jacked!
Friend A: I call claim.
Scott: *whiny voice* No, seriously...
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