The firehose of falsehood, also known as firehosing, is a propaganda technique in which a large number of messages are broadcast rapidly, repetitively, and continuously over multiple channels (like news and social media) without regard for truth or consistency. An outgrowth of Soviet propaganda techniques, the firehose of falsehood is a contemporary model for Russian propaganda under Russian President Vladimir Putin.
The term “firehose” probably wasn’t a coincidence: https://en.wikipedia.org/wiki/Firehose_of_falsehood