A Russian Hat refers to the act of taking a dump in the hood of someone's hoodie and pulling it up over their head.

A ridiculously hairy vagina.

The use of one's cotton candy wrapped in a similar fashion to that of a hat around the head of a penis. Once put into place, this hat is sucked off until every last sugar droplet has been consumed.

when the temperature is less than 15 degrees Fahrenheit, and without wearing wearing a Russian winter hat you would freeze your ass off.