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1. slang A foolish, naïve, or gullible person. You're a bigger sap than I thought if you believe that, Phil. I can't believe I fell for that scam. I'm such a sap!
2. slang Someone who is easily taken in, won over, or entertained by something. Usually followed by "for (something)." A: "I know the film wasn't perfect, but I loved it." B: "Yeah, but you're a sap for romantic comedies." I've always been a sap for mysteries and thrillers with lots of twists and turns.
3. obsolete slang A short club or truncheon, especially as used by police. The officer pelted the man across the brow with his sap, knocking the poor fellow to the ground.
1. n. a stupid person. That poor sap thinks he can convince them.
2. n. a blackjack. (Underworld.) Bart had a sap in his pocket when they arrested him for possession.