I saw a post on Reddit, I knew every meaning of words but I can't get what process of action they were describing. Below is the post they put.
I had to call my boss for help with a machine that would not cooperate. We are talking as I am tightening a bolt and my slips. I split my knuckle open and called the machine every 4-letter word.
Specifically, the problem for me to understand is in what is bolt and slips and splitting knuckle open.