징그러 means like disgusting. When you see something like spiders, snakes, you could probably say like "shoot!" or "holy shit, what the heck is this?" In Korea, we say "징그러" or "아 징그러" you can pronounce like 징: jing --- imagine you say "jingle bell" -> jing 그: gue or gu --- imagine you say "grace" -> gue 러: ru --- imagine you say "russia" -> ru jing gu ru!! = holy shit! However, 징그러 is not swear or slang. It implies like "holy shit!" Let me know if you have any questions.

haha I remember a line from "응답하라 1997": 정말로 징그럽게 싸운다 It is not limited to just saying "creepy" in the english sense... anything you find annoying/offensve/replusive could possibly be suitable for use. In the above line, a shouting match can be just as much like that.

That meaning is similar with "creepy" You can use it when you find some insects ex) 아! 저벌레 너무 징그러워!