Mostly used to in reference to the style &/or fit of the crotch area of womens jean pants. If looking at a pair of pants from their front side it's visabky noticeable that the lowest part of the seam between the legs hangs farrrr below the waist line.
Him-- What do you think of these jeans?
Me-- lmfao fuck no; I would never wear those long bottom crotch motherfuckers.