Corny

This joke is corny.
What's that mean?

The joke has too much corn in it.

: : I believe it comes from rural America (The Corn Belt). Jokes that were so obvious and heavy-handed were considered the kind of jokes the "hicks" would understand.

http://www.phrases.org.uk/bulletin_board/20/messages/1441.html

Thanks. Anybody else?

Hi there, I am a native speaker, and to me, a corny joke means that it is a lame and stupid joke, but generally gets a laugh. One would roll his or her eyes and groan at a corny joke but still laugh.

Here are some examples:
http://www.thejokeyard.com/corny_jokes/index.html

Thanks