During the winter months, when you take a dump on a fat chick's stomach and try to burry your dick into her naval (like a rabbit trying to burrow in a muddy hole). Your ejaculation simulates the melting of the snow, which allows the dirty rabbit (your shit covered cock) to then burrow in a dryer, more suitable burrow for the Spring (AKA the girl's ear canal). During the Spring burrowing process, you are giving the girl a dirty rabbit ear.
My girlfriend shrunk my favorite sweater so I gave her a dirty rabbitear.
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.