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.

The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.

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

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

A person who is ginger and has a round head

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.