I remember reading about this genre on Wikipedia, but forgot what it was called. Books in this genre are wandering/doing things without purpose. There isn't really a plot, just connected small stories. It is close to Picaresque novels, but instead of poor main character it about is a rich, carefree main character. The stories are often humorous or satiric or both.
P.G Wodehouse's Psmith books and others are examples of this genre.
Another detail I seem to recall is that the words has the prefix "voy" or "voyage" or something along those lines. I could remember wrong, though.
Words that are close, but not it so far are:
- Milesian tale
- Absurdist fiction