Mom Butt

The definition according to Urban Dictionary:

"This phenomenon has been around since at least the 80's. It is defined as the elongation or widness of a mother's butt when she wears jeans/pants that are too tight, too short, or too high in the waist. One does not have to be a mom to acquire mom's butt. One does also not need to be fat to acquire mom's butt. However, there is a vast cohort of Mom's Butt sporters at youth soccer games. A true mom's butt shows a panty-line that usually is uneven due to a "wedgie". Pockets are usually too small and too high on the pants, thus, creating the mom's butt shape."