A phrase typically implies that something has aroused sexual excitement in the speaker. Usually said by people named Francisco or Amos.
Amos and Francisco's passionate makeout session in the park really got my cock throbbing. It was a sight to behold, and I couldn't help but feel aroused watching them.
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.