The female equivalent to Morning Glory or Morning Wood.
When a woman wakes first thing in the morning and is gaping wide as if ready for insertion.
"I must have been dreaming about StupidPeanut last night - woke up looser than a bucket of worms"
Girl 1: "woke up with morning loose today"
Girl 2: "did your fella notice?"
Girl 1: "yeah - thanks to the the smell"