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1.
When one person craps with such volume and force that it bounces back and ends up on the bottom and top of toilet seat leaving a saddle of shit for the next lucky person.
" Dude I have to crap so bad but Jim Dye just left a mud saddle for me in the bathroom! That guy can really blow some brutal mudd"
by moma lucian March 22, 2005
 
2.
When you try to pull an upper decker and miss then hit the seat causing a mud saddle
" I wanted to leave an upper decker for the guy who mud saddled me, but I missed and left a fresh mus saddle"
by mama lucien March 26, 2005