Someone who is seen as generic and one dimensional, with little depth or individuality to their character. Typically someone who strives to 'fit in' to be as popular as possible, often not being their true self. Can also simply mean someone who is seen as being a stereotypical character in any kind of way.
"My friend only watches Reality TV and makes fun of anything that isn't the current fashion........he's a real cardboard cutout c**t"
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.