The story
From self- + report. Noun sense 2 was coined by players of Among Us, in which the impostor can report the body of another player they have just killed, as if having just discovered it guiltlessly.
Etymology from Wiktionary, CC BY-SA 4.0.
self-report
Today it means: A kind of survey or questionnaire in which respondents read the questions and select responses by themselves, without researcher interference. Full definition →