Used one time after a person says something silly, goofy or corny, or behaves in a similar way.
Or, on a regular basis, to describe someone who says things or behaves in silly, goofy or corny ways repeatedly.

When you think up something brilliantly righteous while baked.

(adj): 1a. dumb, moronic, or stupid. 1b. funny

(n): 2a. a dork or moron. 2b. a tool

Cocaine mixed with cheese. Originally mentioned in the Tenacious D television episode "Death of a Dream."

Someone, usually a male around his teenage years who pretends to be funny. He uses mostly slapstick humor (usually involving the removal of his own clothing or the putting on of woman's clothing), corny old jokes or in general just acts like a three year old.

As a former cheeseball myself I can attest that most cheeseballs use this humor to try to get cheap laughs out of people in hope that they will like them more. 99% of the time the cheeseball just looks like a jackass however that 1% the cheeseball miraculously goes about making friends.

when your nuts get really sweaty and/or stinky you have cheese balls.

A genuine person that sometimes just can't hold the cheese in.
The typical cheeseball is the sweetest boyfriend that is always ready to put a smile on your face.
My cheeseball usually makes me happy happy happy without even trying and happens to be my favorite person ever.