To have a butt as large as an older female.

Unflattering description of an older woman's big, fat, lumpy, out-of-shape, cellulite butt.

When a female (usually an older woman, particularly a mother) wears unflattering, waist high jeans that give the buttocks a flat, unappealing look. It may sometimes entail wearing sweat pants bought from your local Walmart. Also note the buttocks may possibly look as if there is a large amount of cellulite. Either way, you don't want that.