1)her bra and/or shirt is too tight/small
2)she is overweight
3) a combination of all of the above.
fat girls are notorious for back bacon either because they have outgrown their bras or are in denial that they have such bacon...a larger shirt should cover up the incidental back bacon that can occur even on a thinner woman when a bra is pinching.
back bacon has an unmistakable look...while walking behind a woman, you can see the outline of her bra and the resulting fat spilling over the top of the bra in the back, resembling rolly/rippling lumps that resemble bacon or a pack of franks. x2 if the bacon bounces when she walks, sorta like a muffin top but with the bra vs. the pants
her back bacon is making me sick...that shirt is way too small and so is that bra.
did you see the back bacon on that fat girl in front of us in line? looks like a pack of oscar mayers.