Insult: something smells


On [this](https://www.youtube.com/watch?v=Gz_IwJD_yn8) YouTube video, the
author claims that one way to insult someone is the following:

[![enter image description
here](https://i.stack.imgur.com/wFLxk.png)](https://i.stack.imgur.com/wFLxk.png)

Is that true? The author seemed to be honest enough. How does that make sense?
(Note that I actually know nothing about Japanese)




I took it as "what's this strange smell? - (staring at someone) - oh that
explains it". It basically says "you stink" with more words.

