Sweat thong
After a bold, powerful workout the line of sweat that shows up on your workout clothes coming from your butt crack.
Wow that workout session rocked but wow, you are totally showing your sweat thong.
Ugh, I am (looks into mirror).
Oh well, I guess I did work my ass off.
Ugh, I am (looks into mirror).
Oh well, I guess I did work my ass off.