Rub the rug

1. When a girl has cum in her pubes and is cleaning it out.

Alternatively:

2. When someone or yourself plays with the clitoris of a girl with extensive pubic hair.

1.
Elissa: Ah fuck there's cum all over my pussy!
Marcus: It's fine just rub the rug

2.
Victoria: Oh Dave I need you to rub my rug!!
Dave: Wait do u want me to clean the wine stain or make u cum