That delectable area on a woman's body where the top of her leg meets her ass (or her ass meets the top of her leg...)

Got the covid-19 vaccine

An ass that is so flat and unremarkable that it appears as though a person's legs are hooked directly to their back, and there is no ass in between. People with ass leg syndrome frequently wear pants that jack way up their crack, usually causing shit stains in their undergarments. People who are afflicted with this particular abnormality do not ever get laid because candidates for sexual activity have significant difficulty in finding the ass legged person's crotch, which is of course a prerequisite for sex.

Legs (thighs) that are so big it makes the persons butt look smaller in comparison.

When so much of the top of the girl's leg is exposed that it shows the bottom curve of the ass.