The definition of cornball is slang to describe someone or something overly sentimental in a corny or silly way.
(adjective)An over-the-top holiday card with hearts and flowers and overly romantic poems is an example of something that might be described as cornball.
Cornball is defined as slang for a trite and overly sentimental person.
(noun)Someone who is so overly sentimental that he tears up at long distance commercials when the mother and son finally talk is an example of a cornball.
See cornball in Webster's New World College Dictionary
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adjective
Origin: corn, + (screw)ball
noun
See cornball in American Heritage Dictionary 4
noun
Origin:
Origin: From corn ball, a ball of popcorn and molasses
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