any residential area populated by gratuitous amounts of promiscuous women. A good indicator that you are unknowingly in whisper alley is women of the night lurking in the cut. Also known as glass houses or soapies in the far east.
"Man, barracks FC-371 (Camp Lejeune) 1st deck backside, is such a whisper alley."
Boster: "Yo, Perry, you better stay away from whisper alley, you keep fuckin with those skeezas-you're gonna catch something."