1. a person who smirks; someone who smiles in a smug, conceited, or knowing way

Examples

• The smirker in the back row thought he knew all the answers.
• She couldn’t stand that smirker who always acted superior to everyone else.
• The teacher called on the smirker to wipe that expression off his face.
• Don’t be such a smirker when others make mistakes.
• The smirker’s attitude made him unpopular with his classmates.
• Every class has at least one smirker who thinks they’re cleverer than the rest.