This is a sexual act involving cumming on the insides of a girl ankles. Then proceed to push the feet together until they stick. When this is completed and both feet are stuck together slap her in the face and throw seaweed at her. This should give her the appereance of an angry mermaid
John: Hey man i angry mermaided this bitches ass last night
Gary: No way man! whered you get the seaweed?
John: Your momma gave it to me after I Boned her!