drink from a fire hose

To take on or be inundated by more of something (i.e., work, responsibility, information, etc.) than one is capable of handling. My first day on the job was like drinking from a fire hose—they threw so much at me that I don't know how I'll remember any of it. They're the highest scoring team in the league—trying to contain their offense will be like drinking from a fire hose. We've had so many IT issues this week that we've all been drinking from a fire hose. Thank goodness it's Friday!