We have all pet phrases that we use to communicate to others. He was higher than a kite. They could sell refrigerators to Eskimos. They were half a brick shy of a load. We are speaking from our experiences growing up and our customs.
We use them without thinking and expect others to know what our words mean. Sometimes we are fortunate to see that the other person by a puzzled look doesn't understand and explain what we mean.
Sometimes all we get is silence on their part and no indication they didn't understand. This can occur if they are strangers to us or perhaps in a business setting with people of a different cultural backgrounds or certainly between generations.
When we are communicating we need to ensure that our words convey the correct meaning to our audience.
Do you take this in to account when writing and communicating on the Internet?