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"
by Dr. Nathan Gormley July 13, 2005