Chump (noun)

1. A fool or a simpleton.
2. A person who is easily deceived or taken advantage of.

Origin:

The word "chump" is likely a variant of the word "chunk" which means a thick piece of something. it is first recorded in english in the 19th century.

Examples:

1. He's a chump if he falls for that scam.
2. Don't be a chump and let them take advantage of you.
3. He's a chump for falling for that trap.
4. She"s no chump, she knows what she"s doing.
5. He's a chump, he always falls for their tricks.