LANE: Because you just broke up. I mean I’d be perfectly fine to just hang out here and listen to music and talk, not talk, whatever.
RORY: No, I am not hanging out. We are going to this party. It’s gonna be great. I don’t want to dwell on this. That’s final.
LORELAI: [entering room] Don’t argue with her or you’ll find yourself the proud owner of three garden weasels.
A garden weasel is a multi-purpose gardening tool which allows you to cultivate, loosen, and aerate the soil, while also being used as a weeder. It was invented in 1974 in Germany.
Just as being sad over a breakup made Lorelai uncharacteristically interested in cooking, it seems to have made Rory very interested in gardening, which is out of character for her.