Peeking clam
From Voyeurweb's Wiki
Peeking clam is a euphemism for the view you get of a sexy pussy when viewed from behind.
Sabrina's peeking clam.
Brandie's displaying an alternate view of a peeking clam
Sometimes a windy day will reveal a peeking clam.
Bexx showing a delectable peeking clam. As Homer Simpson would say "mmmm....clam"

