The act of publicly inviting someone (typically via social media) to suck your dick and then blocking them, presumably before getting your dick sucked.
MajToure is cockblocking up a storm on Twitter today.
The keyboard that was shown at the beginning of the 'Hell To The No' number in Season 2, Episode 16 of Glee. It is the 'cockblocking keyboard' because the scene before 'Hell To The No' was the scene of Kurt and Blaine's first kiss. Right before they were about to show Kurt and Blaine's steamy second kiss, the scene cut to the angle of this keyboard, thus instigating a cockblock among the Klaine fandom.
Person 1: What's so special about this keyboard?
Klaine shipper: It is the cockblocking keyboard of evil. I WANT MY SECOND KLAINE KISS!
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.