The name of any location with a temperature that is considerably colder than your liking. This phrase should be reserved for extreme circumstances, not just mild discomfort.
I just got back from the garage and, let me tell you, it is burr-ass cold tittytown out there!
When someone sends you a picture of the sunset, and says this, they mean 'I love you, but it's time to let you go.' The sun setting symbolises the end of a relationship. All good things come to an end, just like the end of the day.