Verb; When a character (real or fake) does something that causes a mass extinction event of most or all other characters. The original comes from Avengers: Infinity War (2018) in which the main antagonist, Thanos, snaps his fingers whilst wearing the Infinity Gauntlet, resulting in half of all the universe's life dies.
Alice: Bob, I don't feel so good. * Turns into dust, dying in the process*
Bob: Oh, god! Joe must have been pulling a Thanos!
Bob: Oh, god! Joe must have been pulling a Thanos!
by Kugeln April 26, 2019