helluva
Helluva (adj) means Informal: remarkable, impressive, or extreme — a slurred form of "a hell of a". Example: “That was a helluva performance.”
How to use helluva
Learner’s notesIn plain EnglishA casual way of saying something is impressively good, bad, or extreme.
Very informal; used mainly in speech and casual writing.
Fill the gap
Can you complete this real example?
That was a _____ performance.
Etymology
A written spelling of the relaxed pronunciation of "hell of a".