Non-spontaneous sexual relations that are initiated with a singular, non-disputable purpose: to achieve an orgasm and get the fuck out as soon as possible. Not surprisingly, garage sale pussy is very easy to obtain and leaves much more to be desired than conventional pussy.
(1) Married couples trying to conceive.
(2) People who hook up at a real-life garage sale.
Much like that 1985 charity fun run T-shirt you scored for $0.25 at the neighbor's garage sale, with garage sale pussy, you get what you pay for.