Refers to the proverbial "wall" a woman (or man, but usually a woman in her mid-30's) hits when they reach a certain age; characterized by a sharp decrease in physical appearance and attractiveness; can be self-inflicted through lack of exercise or merely a pre-programmed genetic inheritance.
Guy #1: "Man, have you seen Hooker T lately?"
Guy #2: "Not since grad school."
Guy #1: "Good god, that girl has definitely hit the wall!"
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