Corny (adjective)

1. Unoriginal and lacking in freshness or spontaneity; trite.
2. Amusingly or cloyingly sentimental or old-fashioned.

Origin:

From the word "corn" which means a grain used as food, particularly wheat, barley, oats, and corn (maize).

Examples:

1. The movie was filled with corny jokes that fell flat.
2. His corny pickup line made her roll her eyes.
3. She found the corny love story to be a bit too much to handle.
4. The corny old song was played at the party and everybody groaned.
5. The corny puns in the comedy act were a bit too much for the audience.