everyone has it wrong. a wet willy is when you get a blowjob and ur willy is all wet and you stick it in the girls ear

When you cum and stick your dick in somebody's ear.

were you are having vaginal intercourse and the male or female urinates during it

The act of moistening one's finger with one's own saliva, and inserting said finger into another's ear canal.

When one wets a finger generally the pinky usually by covering in saliva then inserts into somebodys earhole and spins eraticly causing overall discomfort in order to wreak havoc or humiliate.

licking one's finger and inserting it into an unsuspecting victim's ear for pleasure

to stick ones finger in your mouth, lick it and stick it in someones ear