This is the sexual act of inserting a hammer into a BBW's anus abruptly, using a lubricant made of a previous mixture of faeces and semen, and using the hook part of the hammer to stimulate the clitoris. Continue until the girl creates a sound of both pain and pleasure, resembling that of a whale.
I gave Jeanette Big jugs a tommies whalehammer last night with my dad's hammer. It was like visiting the aquarium!