This is a very effective insult used in online gaming. Not only are you asserting dominance, but you are also telling them that they are black and a slave. This is a term coined by the greatfortnite player named "adjoinFRAGS".
Guy1: "Adjoin, you're trash, kid"
adjoinFRAGS: "Shut the fuck up kid I own your family"
Guy1: *shuts up*
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.