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1.
A male achieving an orgasm by using his own feces as lubricant and breast fucking a female.
Muddy Canyons smell bad :(
by Dannylikestoassfuck February 15, 2009
 
2.
When a girl spreads her tits, a guy shits between them, the girl presses her tits together and he titfucks her.
My best gal pal heard about the muddy canyon online, then had to try it, the slut.
by JBooker December 08, 2013