Babe's Bum
The female version of a Builder's Bum, but way hotter. It happens when a babe in hipsters crouches down and accidentally shows her butt crack. Doesn't matter if she's wearing a thong or not.
My cousin saw her at the gym and nearly fainted. ‘That’s a Babe’s Bum if I ever saw one.’
She leaned over to tie her shoe and gave me a free show. Classic Babe’s Bum.
I was eating my lunch when she walked by. I dropped my sandwich. Babe’s Bum, baby.