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?
To be honest, I can't say that I've ever created any expressions that make sense to only a few people. I do tend to use several terms and the like from sf literature or tv series or movies that I've had to explain to folks in the past. But I can't remember what they are now. Mind Like A Sieve (MLAS(tm)). :)