You've heard of a jam, and a banger. Well this is the mix of the two. A banger only turns into a Janger after it has gained a widespread place in our collective minds, gets it's nostalgic feel, but is also impeccably catchy, and goes hard. (Sometimes without reason.) It is also a personal banger that has become your jam.
"Bro, Mr. Brightside by The Killers is such a fucking janger!"
"Yeah, but my favorite janger is Oops I Did It Again by Brittney Spears."
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.