Meme Magic
It predates 2016: Shira Chess (2023) traces it to mid-1990s occult text files and to Kirk Packwood's Memetic Magic (2004), on using online images to manipulate reality.
Shira Chess, 'Magic in the Air: Memes, Esoterica, and the Internet', Selected Papers of #AoIR2023 (2023), section 'Historicizing Meme Magic'
The claim, voiced on 4chan around the 2016 US election, that spreading memes changes real events.