[SUGO-I]

It's an adjective. It means 'GREAT, AWESOME, AMAZING / TERRIBLE, DREADFUL'. It has two different definitions. It could be positive, and could be negative. It depends on the situation.

'SUGO-I NE' usually means 'It's awesome, isn't it?'

'NE' is put at the end of a sentence. It is used when we want agreement with some assertion.