A case of the black ass - You're so drained your ass is black and it's like it's been

You're so drained your ass is black and it's like it's been sitting in a coal mine for a week.

I had the black ass after I pulled an all-nighter and ate a whole pizza.

My sister got the black ass after she cried for 2 hours straight.

I got the black ass so bad my socks were stained.