a "massage parlor" where the masseuse (usually a young, attractive woman) gives a "happy ending" (i.e. a hand job or a blow job); for a gratuity, the customer may get more than the "happy ending"
"Welcom to Fancy's RubClub. That will be $150 for the massage with happy ending. Anything more is negotiable."
n) the female variation on the spank bank - an area of the short term memory in which arousing images are stored for subsequent recollection and masturbation.
Jennifer: Hey Brit! Did you see that guy?
Brit: Who? The one that looks like Scott Baio?
Jennifer: No, the one that looks like Gary Coleman!
Brit: Oh my god! Look at him! That's goin in the rub club!
Jennifer: Hey-oh!
-or-
Solange: Did you see that guy getting his swell on at the gym?
LaQueesha: Oh...my...god. Rub club.
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.