Common options:
* Ripper: This is a very versatile word meaning excellent, great, or fantastic. It can be used for almost anything!
* Top notch: Another common way to say excellent.
* Crackin': This word is used to describe something that is really good or enjoyable.
* Strewth! This exclamation is a slangy way to express surprise and can be used to indicate something is really good.
More informal options:
* Bonza: This word is often used to describe something that is great or wonderful.
* Fair dinkum: Meaning authentic or genuine, it can also be used to express approval.
* She's a beaut: This is a playful way to say something is excellent.
More specific options:
* Absolute ripper: This emphasizes how fantastic something is.
* Deadset: This is another way to add emphasis to the word "excellent" and means definitely or truly.
The best word to use will depend on the context and the speaker's personal style.