What is the meaning of oyishi?

"Oyishi" is not a standard Japanese word. It's likely a misspelling of "Oishii" (おいしい), which means "delicious" in Japanese.

The pronunciation of "oishii" is similar to "oyishi," so it's easy to mix them up, especially for non-native speakers.

If you're trying to say "delicious" in Japanese, you should use "oishii."