A Costello Clapp is when after coitus, instead of cumming in or on your partner, you cum into your hand and proceed to smack them in the face with the handful of cum.
After I was done having sex with Melyssa, I costelloclapped her across the face.
A girl who is intensely insane but has bangin' Helen Keller jokes, including one about waffles.
Favorite activities include dressing up like old men and being hunted down in Vanity Fair
"Who is that chick ungracfully meandering down the hallway?"
"That'sERICA CLAPP (aka Clappy)"