Almost everyone coins or uses expressions that make sense to only a few people. What word or phrase do you use most often that you have to explain the meaning of to others?
Sometimes I still say I have to go to the MLOTB. This expression dates back to high school 10 years ago. (I was in high school 10 years ago? Jeeeeeeez, I'm old) Megan was the one who referred to the "magical land of the bathroom" at one point, and then I started using the acronym.