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Presumably 내 (nae-) and 빼다 (ppaeda).
내빼다 • (naeppaeda)
- (Gyeongsang, Gangwon) to run away
2009 February 17, 김종필 [gimjongpil], “급사등이 [geupsadeung'i]”, in 한국구비문학대계 [han'gukgubimunhakdaegye][1], 경상북도 청도군 이서면 [gyeongsangbukdo cheongdogun iseomyeon]:이놈이 막 둘고 티가 내빼뿌린 기라.- Inom-i mak dul-go ti-ga naeppaeppurin gi-ra.
- So this bastard held it, took off and ran away.