The story
From douchebag + YouTuber, ostensibly popularized by American YouTuber and streamer MoistCr1TiKaL in the late 2010s.
Etymology from Wiktionary, CC BY-SA 4.0.
douchetuber
Today it means: A YouTuber who is arrogant, rude or obnoxious; a douchebag, especially one who flaunts their wealth, carries out pranks in poor taste, or engages in fraudulent activities. Full definition →