Like a typically wet willy, except instead of wetting your finger with your mouth you stick it in your girls vagina and then her ear.
The only thing grosser than the feeling of a wet willy is knowing it is a WAP willy instead.
The act of putting your finger into a wet ass pussy (WAP) and putting your finger into someone’s ear
“Dude, AP just gave me a WAP willy when he came out from his room with Kay”