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1.
A somewhat archaic word for coward. Most commonly associated with the South and Southwest
"He's too afraid to stand up to him"
"What a yellow belly"
by TheWillbilly October 17, 2007
 
2.
Another name for a Coors Original Beer (the banquet beer). Given for it's yellow labeling...
Hey Snoop, hand me one of those Yellow Belly beers out of the cooler.

I only buy Yellow Belly beers for shotgunning purposes
by MrSancho November 05, 2010
 
3.
A YellowBelly is the name given to someone born and bred in Lincolnshire, England, uk.

People born in Grimsby have their own name "codheads" due to Grimsby being a fishing town.
"Where are you from?"

"Lincolnshire"

Oh, a yellowbelly"
by Kayuk September 08, 2007
 
4.
A Wexford Man. called because of there jerseys. A real man, who saved the Irish in the Civil War, the 1798 rising. Also called yella belly
come on the yellow bellies, up Wexford over the Bar!!!
by Butty July 14, 2004