Perhaps compare 그렇게 (geureoke).
그꾸 • (geukku)
- (Northern Gyeongsang) to that extent, in that way
1984 April 14, 안희경 [anhuigyeong], “삼동서의 가문 자랑과 세 사돈 [samdongseoui gamun jaranggwa se sadon]”, in 한국구비문학대계 [han'gukgubimunhakdaegye][1], 경상북도 예천군 보문면 [gyeongsangbukdo yecheon'gun bomunmyeon]:야들아 뭐하로 그꾸 너 삼동세가 그꾸 싸우노?- Ya-deur-a mwoha-ro geukku neo samdongse-ga geukku ssau-no?
- Hey, what are you doing that makes you three sisters-in-law fight in that way?