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1.
When one male in a homosexual couple inserts a hose into his anus and fills it with water, essentially making mud with the fecal matter for his partners enjoyment during penetration.
Hernandez removes his sequin covered G and slowly inserts a hose into his love hole. Alfredo turns on the tap till his love emits a little squeal of delight and then in one quick movement yanks the hose and slams his throbbing man meat into the moist hole with a satisfying squelch....Making Mud
by SpikeyMonkey November 21, 2008
 
2.
The act of defecation.
If you're looking for Mike, he's in the bathroom making mud.
by hughmonger October 30, 2003