Help to translate "북공고야 난.ㅋㅋㅋ 토요일날 북공고로 와 다들 ㅋㅋ"
What means "북공고"? I think is the part which is confusing me more.

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englishpump is correct, it is the name of a school. :) 북공고 is North Technical High School.

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I don't even know what that is.. Maybe I am too old to know new Korean words.. -.- If I am right, it may be the name of a high school. '고' is an abbreviation of 고등학교 (high school).