that girl has slept with so many men, that she'll have to be buried in a y-shaped coffin, to accomodate her bucket fanny
someone who has shagged so many men that their vagina resembles a flabby bucket
"that girl has slept with so many men, that she'll have to be buried in a y-shaped coffin, to accomodate her bucket fanny" What is the definition of "bucket fanny"?