Term used to identify a female as a Lesbian, as the "rug" is slang for female pubic hairs. Thus, rubbing a "rug" on another "rug" represents two lesbians grinding their pelvic areas together.
When you tie a rubber band to your dick, and then attach the other end of the rubber band to your sock, so your dick is in a constant state of extension, overtime this will enlarge one’s cock.