RORY: God, look at that. It’s like he’s eating her face [of Tristan and Summer].
PARIS: Okay, that’s it. I’m getting the fire hose.
Paris means to use the hose to force Tristan and Summer apart – a common way to separate fighting dogs is to spray them both hard with water from a safe distance, so she’s comparing them to animals.
The Annotated Gilmore Girls 