snow rules 

A temporary pseudo-anarchical state in which most official rules and regulations (i.e. laws) can be disregarded/ignored completely, without fear of capture and prosecution. Originated during heavy snowfall in small southern townships that contained an abundance of drunken, overgrown and overzealous youth.

Chip had just smashed a random car with snowballs, and then assaulted the driver immediately afterward. However, he wasn't worried; after all, it was snow rules.

snow rules by Mart Pax February 1, 2010

Snow Rules 

When snow conditions cause driving to become difficult. Conditions inhibit the ability to stop, go, see lane markings, etc

Note: only applies while snowing, before being plowed, with limited other traffic on the road

I was waiting too long at the traffic light, so I just went. Snow Rules!
I don't know if this road is one lane or two, oh well. Snow Rules!

Snow Rules by kalif_90 February 23, 2015

Rule of Snow 

The rule of snow is the rule that a pretty girl will always look twice as pretty when it's snowing outside.

Usually only happens when the snow is falling softly, not common in blizzards or other similar conditions.

Person A: I already knew Molly was a gorgeous girl but yesterday it was snowing and when I saw her standing outside she took my breath away!
Person B: Gotta love the Rule of Snow.

Rule of Snow by Grape-Chan February 24, 2013