Yesterday there was a story on the HN front page about a professor at the State University of New York at Albany who acts as an expert witness in litigation, sometimes in suits against Monsanto. He is 86 years old. Some commenter called this a "side hustle". WTF does this term mean, nevermind how ridiculous it is to apply it to this gentleman.^1 What purpose does it serve to use the term "side hustle". How does it improve upon the language that already exists.

1. Generally there are very few if any "full-time" expert witnesses. Obviously to be an "expert" one generally has to have engaged in something other than testifying as an one. Some might be semi-retired or retired professionals.