What is Brown Magic Marker?
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(BMM) The brown streaking marks left in a toilet bowl after flushing large amounts of soft fecal matter. Usually the result of eating burritos and drinking multiple beers.
"Ricardo is gonna kill me. I brown magic markered his toilet. Fuck! Hand me a towel"
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When some is being a complete Jackass or being a total douche.
Guy 1: "Hey guys I just pinched off a loaf in the McDonald's b..