gallon bundle - a woman whose chest is so big it could take a gallon of beer

a woman whose chest is so big it could take a gallon of beer to fill it up.

He said she’s a gallon bundle. I believe him. She drinks like a beast.

I’m a gallon bundle. I can chug a whole bottle in one go.

That girl’s a gallon bundle. She’s got the guts to match the volume.