Japanese word that i can't find...

...in any dictionary, be it online or in the books i have.
The sentence is -
"Yappa Bokko ha(wa) sugeeya"

So, what 'sugeeya' means?
tried to find the parts of the words in case it was two words (no spaces makes it hard), but to no avail.
Pretty please?

すげえや→すごいんだ

And use the Japanese Ask Questions thread next time, it's not fucking hard.