A sexual act where two or more gay men engage in penetrative sex with their assholes. This is usually accompanied by a copious amount of lube. According to the Geneva Convention it would not be considered gay butt sex but rather just butt sex if one of the parties involved utter the magic words "no homo".
Charles: Yo I had Gay Butt Sex yesterday. It felt amazing!
Bao Dao: Yeah I know I did it with you!
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.