drink from a firehose
To be overwhelmed (with work, information, etc.); to be inundated with an unrestricted or unfiltered amount.
noun
Alternative form of fire hose (in all senses)
2015, Ismail Khalil, Erich Neuhold, A Min Tjoa, Li Da Xu, Ilsun You, Information and Communication Technology: Third IFIP TC 5/8 International Conference The programmer must override the method on_data(), which processes each tweet that is taken from the firehose.
verb
To wash something down with a firehose; to douse with a large amount of water (or chemical agent) sprayed from a hose, to extinguish a fire.