굿굿 is English written in hangeul = Good Good 잘보고 가요 = 잘= Well or good 보다= See or try 고 = and 가다= Go 잘보고 고요 = would be something like 'Enjoy seeing and go well.'

'Good. Good. I saw it happily.' in English. Many of Korean say '굿' in Korean language when they feel good. haha.