a long weekend
This expression decribes not working on the weekend, and also, having an extra day off on Friday or Sunday -

probably because of a national holiday. At least three days off including Saturday and Sunday.

   example: I feel refreshed after my long weekend. I love having three days off!

a dirty weekend
This expression is usually refers to a couple going away somewhere for the weekend to have sex. It is often used to describe a secret relationship where the couple are possibly married, but not to each other (an affair)

   example: The boss was caught having a dirty weekend with his secretary! His wife is going to divorce him.

a Saturday night special
This slang phrase is becoming a little old fashioned these days. A Saturday night special is a cheap and small

gun. The name first appeared in the New York Times back in the '60s.

   example: The robber was caught by the police carrying a Saturday night special.

Sunday best
Your Sunday best are your smartest or 'best' clothes. If you were going to a formal party you would wear your

Sunday best. Traditionally people would dress in smart clothes on a Sunday when they went to church.

   example: Joanna looked lovely all dressed up in her Sunday best.

Sunday driver
A Sunday driver is someone who drives very slowly. The description has a negative meaning. We use it to

desribe a driver who makes other drivers angry because of their slow driving. Sunday drivers go for a drive on

Sunday just for something to do. They are not in a hurry and are not going anywhere special.

   example: Drive! Come on! Come on! I'm in a hurry! Move out of my way! I hate sunday drivers!