"bulging belly" is correct and usable in written English.
You can use it to describe someone who has an unusually large or swollen stomach, as in "He had a bulging belly that made him look pregnant."
But patting his bulging belly, he notes what a problem that's caused.
"It's German," Mustafa informed us and pulled his pants over his bulging belly.
Union Square was packed with people of all ages taking selfies and laughing at his bulging belly and lumpy form.
On the red side, a fat-faced pig pats his bulging belly, hand up in happy resignation: não obrigado!
Tapered ears, a pointed green hat, curled shoes, a bulging belly and red circles for cheeks: It looks like... an elf.
"I didn't mind the seating stands so much," shrugs Hadid, sitting poolside beneath the bulging belly of her building, which finally opens to the public on Saturday.
Look at the stone-age Venus figurines, images of women with chunky drumstick limbs and bulging bellies from 20,000 years ago.
And while they share the same indignity of bulging bellies, flabby thighs against flabby thighs, they also share the same bittersweet dream.
The bulging bellies of more pregnant women protrude from its skin of ceramic tiles, along with motifs of safety pins, cassette tapes, hearts and yet more wheels.
The rest of the force gathered in the station yard, a dozen men in jeans and T-shirts, smoking and chatting while pulling on flak jackets over their bulging bellies.
The police officers formed a skirmish line at the bottom of that little hill over there one night, menacing but incongruous in their baby-blue shirts and helmets, bulging bellies and snouted gas masks, the kind of vivid snapshot people who were on the streets here in 1968 still carry with them.
