Couple of years ago the use of slang that consisted of making portmanteaus of the word “pussy” (using the suffix “-ussy”, also word of the year 2022 IIRC) with other words rose. At first it was mostly for implying said thing was used as a pussy (thrussy: throat pussy, bussy: boy pussy) but then it evolved into a comedic way to refer to “hole of said thing” (chussy: hole in the chest as in pectum excavatum).
In this case, this vehicle is called eBussy because it’s a tiny electric bus. But due to the slang, it can also be interpreted as “electronic boy pussy (as in a guy’s anus, for gay sex)”.