Which means when someone uses the phrase "snatch your wig" or anything related to "wig"
I see many people using this on twitter, with a very lively intonation and I do not understand why or where that expression came out lol

Question

Answer

It's not something I have ever heard - I guess it's an example of generational jargon. 
Urban dictionary is usually good for this sort of thing - http://www.urbandictionary.com/define.php?term=Wig%20Snatching
BUT - always check the ratings, which give you an idea if the entry is serious or not.

Answer

I have never seen "snatch your wig."  But "wig" by itself -- or "wig out" -- can mean to get really angry about something or to act a little crazy about something.  Example:  "My mom totally wigged out when I told her that I don't want to go to college."   "Don't wig out.  Everything will be okay."    This is related to a somewhat old-fashioned expression -- "flip your wig" -- which has the same meaning of get really angry or crazy about something.

집에서 편안하게 언어를 배울 수 있는 기회를 놓치지 마세요. 경험 많은 강사진을 살펴보고 지금 바로 첫 수업을 신청하세요!