쩐다, 쩔다쩔어, 개쩐다. 쩔어

쩐다, 쩔다쩔어, 개쩐다. 쩔어 means awesome, really awesome.

쩐다 Jjeonda, 

쩔어 Jjeol-eoh

쩐다쩔어 Jjeonda Jjeol-eoh,

개쩐다. Gae Jjeonda

The original meaning of 쩐다 Jjeonda, 쩔어 Jjeol-eoh is pickled in salt. It means that the salt has seeped deep into it. However, these days, it is an expression used when seeing an extraordinary situation.

source: https://namu.wiki/w/%EC%A9%94%EB%8B%A4