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It's the cousin of "tossin a salad". Instead of using your tongue to stimulate an anus, you use your eyelashes like a butterfly kiss. bananus
Sara was afraid if she blinked too much while the brown butterfly was in effect I would shit in her eye upon opening. I let her know I have control of my anus by letting a little fart out and taking a single eyelash with me as a keep sake forever.
by R2RO April 25, 2013
When you have a bowel movement without cleaning risidual fecal matter and then surprise a person by spreading ones "butt cheaks" and "smooshing" it against a person
brown butterfly Charlie gave Peter a brown butterfly while he was passed out from to much drinking.
by dycky January 16, 2008