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1 definition by @dEpP

The noise required to mask the sound of anal secretion and subsequent bowl splash in a public or private restroom when one or more persons are in attendance with the person discharging, to thereby avoid the awkward silence that is present and periodically disturbed by the excretions of the person in question.
Dude, that was really awkward. The guy in there was playing his ipod, utilizing its brown noise capabilities.

The whole time I was in there this dude kept coughing to cover up his dump. He was clearly brown noise(ing).
by @dEpP September 14, 2010