What is Brown Magic Marker?
1.
(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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A group of people of another race than yours. Commonly used while in a crowd of them, you could for example say
Wow that free stuff sur..