Peshengwengweng comes from the Latin word peshengweng which means to hoverpast your waistline at a high speed and the last Weng means The sound a AR15 makes.
Some people even use I tg for slangs
Peshenwengweng was used in the li ate 21st century when an artiste sang a song with that sound. It became a laughing stock hence people say it's an imaginary gun.
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.