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Longman Dictionary of Contemporary English
beer belly
noun
EXAMPLES FROM CORPUS
▪ Costner, with his easy grin, incipient beer belly, thinning hair and bright devilish eyes, plays broken-down convincingly.
▪ He had a beer belly that hung over the top of his filthy jeans.
▪ She was grizzled old woman with a beer belly and voice to match, and she knew something about justice.
▪ The contractor was a tall man with a beer belly and a cowboy hat.
▪ The kite refers to a beer belly.
The Collaborative International Dictionary
beer belly

beer belly \beer" bel`ly\ n. a protruding potbelly caused by excessive drinking of beer.

Syn: beer gut.

In one of the less surprising revelations of the year, researchers at the University of North Carolina (UNC) and colleagues have confirmed that excessive consumption of beer can lead to the condition commonly known as beer belly. At the same time, however, they discovered that, beyond aesthetic concerns, the condition may point to health hazards of a more serious nature. In a comparison of beer drinkers and wine drinkers, the scientists found that beer tends to build a central paunch, or ``potbelly'', while wine drinkers tend to have narrower waists, even when the same amount of alcohol and calories is consumed by both.
--The Scientist -- December 11, 1995.

Wiktionary
beer belly

n. Excess fat stored in the abdomen attributed to the consumption of beer.

Usage examples of "beer belly".

Why couldnt he have put on weight, developed a beer belly and worn his pants slung low under it, rather than honing down to such lean muscularity, even more finely tuned than during his football days?

The floor manager had the beer belly and flash clothing that seem always to go with salesmen in the motor industry.

A mess - fly unzipped, crew cut matted down both sides of his head, beard let go for two days, holed skivvy shirt pushed by his beer belly through a few open buttons on his shirt - he pedaled away wobbly for the flophouse.

He still had the muscles, but he had grown a great soft pillow of a beer belly.

It was a bit too tight and had crept up to create a gap above his baggy shorts through which his hairy beer belly protruded.