Top Definition
fat bon·er |fat ˈbōnər|

When a person starts thinking about or gets ready to eat food and their stomach expands. The act is similar to how a man's penis will enlarge when thinking about or getting ready to perform the act of sex.
"I love lasagna so much, I'm getting a fat boner just thinking about it."
by mootish21 January 07, 2010
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