The mist that supposedly arises from the toilet during urination and flushing and gets all over everything in the bathroom.

To propell night sweat from the buttocks onto your partner's face via flatulance.

When a man wakes up in the morning, sometimes, he gets a boner, an erection, a hard on, whatever you want to call it. Sometimes, when a girl wakes up in the morning, she is wet, aroused, horny.

For men, it's called "Morning Wood."

It is called "Morning Mist" for girls because of the warm and wet feeling produced down below. Kind of like a mist.