Basically meaning you take a shit and get get it all over the bowl including the underside of the seat.
"hey make sure you look under the seat if you plan on blasting mud."
by spokes1124 December 24, 2003
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Brendan: Dude, the Mexican (the food, not the server) made me blast mud this morning.
by the coMANd'r October 10, 2016
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