Unsigned wrote...
Sugoi: Amazing, awesome, astounding.
There is also Sugei which is the supposedly the same as Sugoi. I can't remember what kind of person says this or if it's just like saying 'iya' instead of 'iee'.
It's a bit of a slang, really. Mostly used by teenagers and thugs.
This also applies to other words:
dekai -> dekee
janai -> janee
Fans of Bleach should be familiar with it, I think Ichigo tends to do that a lot.