！
I found something really amazing!
Literal
Incredibly good thing [object-を] found [emphatic-よ]!
すっごく is an emphatic pronunciation of すごく — the extra っ intensifies the word. いいもの 'a good thing, something great.' 見つけた 'found' is plain past. The よ and exclamation mark convey excited sharing. Short and high-energy.