Similar to motor-boating, mud ruddering involves grasping each side of the buttocks, gently spreading the cheeks and placing one's face on the poop shoot; then shaking the head back and forth as if saying "no" while proceeding to make a motorboat sound. Essentially, the buttock cleavage equivalent to motorboating. Unlike motorboating, mud ruddering makes no sex distinction, as you can mud rudder anyone who has buttocks.
by Scotty By Nature December 14, 2011
For a man to take a shit and lay it between the butt cheeks of another man and put his dick between the two cheeks like a hotdog in a bun and slide back and forth so that the shit squishes all over the mans cock and balls causing the man to shoot hot man goo all over the back of the other man.
by squishy face retard November 3, 2010