A slang term used to describe someone who is so high (usually from smoking) that they become easily distracted, lose focus, or forget what they were doing or saying.
"She was trying to tell a story, but got sidetwacked halfway through."
"I told him to grab the snacks, but he got sidetwacked cleaning out the fridge."
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.