When someone (usually male) takes a big dump in a toilet, then proceeds to shoot at the piece of poop with a strong stream of pee. Typically, the goal is to break the poop into two pieces. This can most easily be accomplished if the poop is in log form.
Jason (on the phone): "Hey I gotta hang up. I need to go in the bathroom for a round of poop and shoot."
Platoon daddy: “heyfuckface, where is SSG Jody?”
Sgt o’cheese: “I heard him say that he was going to the port-a-shitter to have a poop and shoot. Private Cuck’s wife sent him nudes.”
Brought to public attention by Bob Woodward and Carl Bernstein in the book on the fall of Richard Nixon, All The President’s Men, ratfucker was Nixon’s term for a political operative who sows chaos among opponents; an agent provocateur. It is thought to have originated among campus political rivalries at USC, and seems to have some usage in the US military.
Along with Nixon’s other ratfuckers, Roger Stone caused fights at otherwise peaceful Democratic Party protests to generate a false narrative that the Democrats were violent and dangerous.