daylight

The view obtained when you look at a womans ass from behind while she is wearing tight pants. If you can see daylight through the crotch of them, she's not overweight.

I watched Ann walk by today and noticed that she definitely has daylight.

fairbunnage

An ass that stands out in a crowd.

I saw Joyce out with her friends last night and I could recognise her from behind because she has fair bunnage.