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1.
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.
"Look at me Lila I'm a Viking!" as this particular cheeseball blocks the path of his girlfriend in an aisle while wearing Viking horns.

"I can speak bird - 'meow, meow'" - said as someone points at a pidgeon in a park.

Guy A: Wow you like men
Guy B: No you like men
Guy A: No she likes men (pointing at a girl)
Guy B: Haha girls like men! (Both in this case were cheeseballs)
by zachKorner February 24, 2008
 
2.
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.
Melvinis acting like a total cheeseball
by Soob March 19, 2004
 
3.
(adj): 1a. dumb, moronic, or stupid. 1b. funny

(n): 2a. a dork or moron. 2b. a tool
1a. "That new MTV show is frickin' cheese ball."

2b. "That Lou, lol, what a cheese ball."
by GJB April 19, 2006
 
4.
Cocaine mixed with cheese. Originally mentioned in the Tenacious D television episode "Death of a Dream."
I was up all night shooting cheese balls.
by Brian Turwilligar May 19, 2007
 
5.
Coming from the word "cheesy", "lame", usually refers to guy who tries to act hot but fails greatly at it. Just think of a greasy cheeseball.
He acted like such a cheeseball
by IP November 15, 2004
 
6.
A person who often says corny things at the wrong times, thinking they are funny and cool. Usually can be found wearing the typical cheeseball attire: polo shirts that are too tight with a possible popped collar, shoes that are supposedly Italian leather, and hair with enough gel in it to start a small housefire.
Me: Man, that Wesley Turner guy sure is a cheeseball.

Kevin: Yeah, almost as bad as Jody Cataldo.
by DboyFresh March 18, 2009
 
7.
when your nuts get really sweaty and/or stinky you have cheese balls.
"hey dude whats that smell"
"oh i havent taken a shower today so its just my cheese balls"
by gobeavs75 November 25, 2009