긔 means nothing. There is a writing style called 긔체 in which all sentence ending is '-긔'. It is used only among some teenagers. They said that this style started at a internet community called 쭉빵카페. 나 긔엽긔? = (나 귀엽지?) 너무 좋긔 = (너무 좋다)

Yes! it is slang. nothing means )