Dropping mud 

Having to take a shit right after you drink coffee.

I drank and extra large coffee and had to take a mud dump right after. I was dropping mud

Dropping mud by Jpeso75 January 20, 2018

mud dropping 

to excrete fecal matter from an elevated position

my mud droppings were so large they made me stand up from the toilet

mud dropping by Danyo February 19, 2003

mud dropping 

To excrete fecal matter while standing up.

I couldn't find a toilet in time, so I did some mud dropping on the way home last night.

mud dropping by Avolin February 19, 2003

Dropping your mud 

Usually important in the gay scene: a guy whose been banged without condums and is filled with cum....and then SPLAT, he "drops his mud"...and out comes all of the warm jizz on the floor!

One example is: "Yeh, I got so fucked last night that I thought my anal canal wouldn't take any moe, and then I just gave it all up, and dropped my MUD right there on the bedsheets"

Dropping your mud by Dr. Nathan Gormley July 31, 2005