Similar to a Wet Willie but instead of licking a finger and placing it in someones ear, you place the wet finger in a vagina.
She thought I was going to give her a Wet Willie but I gave her a Wet Jessie instead.
When you're awake in the bed next to a sleeping girl, you masturbate and release it all over her. The key here is to make sure she sleeps and does not wake up until you have left the house as she will be shocked and confused about what is on her. Particularly good after a night of drinking.
She was sleeping, and I was horny. I watched a porn quietly, then gave her a Wet Jessie.