A rostella is a made-up word that doesn't have a real meaning.
Rostella is just a fun word to say and doesn't make people think of anything specific.
Examples:
I like to say the word rostella.
Rostella is a funny word.
Do you know what rostella means? It means nothing!
I saw a rostella in my dream last night.
In the land of rostella, everything is silly and fun.
Rostella is a word that I made up for my secret language.