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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1.
The act of performing incest with a father, either yours or a friends. This could include butt-sex, blowjobs, handjobs, and fingering, ..