I had to google "30 degrees" to determine the meaning of his nickname. Here it is:
"30 Degrees" is a slang term used to describe the act of urinating in public. The term originates from the idea that when one urinates in public, they are exposing themselves at a 30-degree angle to anyone who may be watching. This act is often seen as offensive and vulgar, as it goes against...
www.fastslang.com
There are two meanings listed, one Normal and one Offensive. Here's the Normal one
"30 Degrees" is a slang term that has been gaining popularity in recent years, particularly among young people. The term refers to a state of mind or a feeling of being completely relaxed and carefree, as if one were on a tropical island where the temperature is a perfect 30 degrees Celsius.