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1.
Symmetrical skid mark left by a wet fart. Not to be confused with shart.
That fart left a buttflower and it wouldn't wash outta my shorts so I had to burn them.
by Dr Evil the Great March 31, 2006
 
2.
The act of passing gas.
Dude come and smell this, I just let out some butt flowers.
by KyleJS April 05, 2008