Plausibly 필 (pil) + 롭다 (-ropda, suffix deriving adjectives). Perhaps compare 폐롭다 (pyeropda, “to be annoying, tiresome”).
필롭다 • (pillopda) (infinitive 필로워, sequential 필로우니)
- (Hwanghae) to be uncomfortable, inconvenient
1996 January 2, 이영로 [iyeongno], “연평도의 방언 [yeonpyeongdoui bang'eon]”, in 연평도 이야기 [yeonpyeongdo iyagi][1], 인천광역시 옹진군 연평면 [incheon'gwang'yeoksi ongjin'gun yeonpyeongmyeon]:그 도구를 쓰니 필로워서 못쓰겠어- geu dogu-reul sseu-ni pillowoseo motsseu-gess-eo
- Using this tool is so inconvenient so I can't use it.