To purposely trigger oneself by bringing up past embarrassing and/or upsetting events without prompting from others. An individual will often bring up a subject or person as a joke to their friends, and subsequently hurt their own feelings.
“Stop jonkering yourself mate!”
“You have to forget about him, it’s just gonna jonker you all over again.”
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.