What does 새끼 mean and is it actually a curse word?

It literally means babies (of humans and animals) but it's also a curse word. Most people use context to differentiate between the literal meaning and the curse word.

Is “새끼” a swear word when used by itself? Or it's just another way to say kid?

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What's the meaning of 놈 and 세끼? Many K-dramas use these words a lot, but some use them as curse words too. - Quora