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When a woman with large breasts smacks herself in the head with one or both of them as the result of sudden up & down movement.
Riley's sports bra failed her, and she ended up giving herself a steady barrage of udder uppercuts on her evening run. Luckily, she managed to avoid a knocker knockout.
When the impact of an udder uppercut is so forceful that it renders her unconscious or disorients her.
Riley was riding McMurray so aggressively that she suffered a knocker knockout as the result of a stiff udder uppercut.