A very sweet drink such as Hawaiian Punch or a lemonade that gives you sharp stomach pain.
"Fuck man, that strawberry lemonade is some belly juice. My stomach is killing me."
A big belly resembling a beer belly in typically young adult male that is the youngest child. Caused by permissive parents who spoil the child with lots of sweet treats and minimal work, consequences, or discipline.
I want to see how many times I can hit Ross's big fat juice belly in a minute with this wiffle ball bat.