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The act of slipping someone a note whilst they are making a brown in the toilet.

Often played in the workplace when you notice a colleague enter the toilets. A dangerous game to play if the person behind the door turns out not to be the intended recipient of said note.
Alex: What's Kyle doing following Martin into the toilets like that?

Richard: He's probably "Brown Noting".
by b00mdr1ve8y November 22, 2013
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