Damp Pencil
When you fall asleep having sex and your penis stays inside the vagina for the whole night. The next morning when you wake up with morning wood still in the vagina is called damp pencil.
"Dude, I had a crazy damp pencil this morning!"
"Bro, we had so much sex I woke up with damp pencil"
"Bro, we had so much sex I woke up with damp pencil"