riding on the sugar high of sth.

[Sarunnio]

Hans didn’t know exactly what he wanted, bu the had tasted it. On the other hand, he did know what bored him to tears, and he was done with it. No more passing days as the living dead, no more dinners where his colleagues compared cars, riding on the sugar high of new BMW purchase until someone bought a more expensive Mercedes. It was over.

What does the phrase like “riding on the sugar high of …” mean?

thanks in advance.

[Dozy]

“riding on a sugar high” literally means enjoying a “high” (feeling of elation, excitement, etc.) that supposedly follows consumption of large amounts of sugar. The enjoyment at the purchase of a BMW is being compared to a “sugar high” probably because it initially satisfied a desire but proved short-lived and ultimately dissatisfying.