It's from a song and I don't really understand every translation I've seen. The whole verse/sentence goes like 막상 티격태격 서로를 향해 겨누지만 고마운 줄 모르고 배부른 거지 뭐. (for context)
I'd be glad if someone helped me!
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티격태격 is a common onomatopoeic adverb describing two people quarreling, usually in a trifling way rather than seriously (You can also say 티격태격하다, to quarrel).
e.g. 아이들이 늘 티격태격 싸운다 = The children always fight with each other.
막상 티격태격 서로를 향해 겨누지만 고마운 줄 모르고 배부른 거지 뭐. = They quibble and go after each other, taking what they have for granted rather than being grateful for them.