While pounding some brown eye, you pull out your cock and smear it all over her butterfly tramp stamp.
“I was pounding Jill’s ass hard last night. Then I whipped out my cock and gave that trick a Muddy Butterfly.”
Muddy Butterfly: define #2
When scissoring with your partner, you simply tap your bholes together. Much like an Eskimo kiss, just with your bholes.
“Hey baby, instead of going ATM, let’s just muddy butterfly.”