Helluva (adjective)

1. Used to emphasize that something is very good or very large.
2. Excellent.

Origin:

Early 20th century: blend of hell of a and hell of a lot.

Examples:

1. That was a helluva party!
2. That's a helluva car you got there!
3. That was a helluva performance!
4. She's a helluva cook!
5. That was a helluva game!