What does '폭풍 영어' mean?
I know what 폭풍 means by itself..but is it a type of slang when you say 폭풍 영어?

Question

Answer

네. 슬랭 입니다. 은어라고도 하지요.
주로 젊은 사람들이 새로운 언어를 많이 만듭니다. mostly young people do making new word, called 슬랭 or 은어. :)

뜻은,
폭풍영어 : great english skill. kkkkk
great as storm, english skill. :P (좀 웃긴 말 ㅎㅎ, this 슬랭 is sounds funny. kkkk)

I found this imformation on internet, serching with "폭풍영어" in Naver website. http://naver.com

원더걸스, 예은 "폭풍영어실력" => 원더걸스의 예은 shows her great english skill on the interview.

즐 한국어!

Answer

It’s kind of joke.
You can use 폭풍 as a adjective.
For example, there are 폭풍성장, 폭풍흡입.
As you know 폭풍 is a storm.
If you use 폭풍 as a adjective, then it means radical change and a great[considerable] change.
Beside Its combination of words are funny so it’s became a joke.
폭풍흡입 means eating food too much and quickly.
It’s used within young person.
We use 폭풍다이어트.

Answer

According to my imagination, it seems to mean ' Storming English (Lesson)' . ^^
Sometime, '폭풍'  means very energetic, dynamic ,intensive unofficially.

Answer

폭풍영어. 저는 처음 보는 단어입니다. 신조어거나 은어일 가능성이 높네요.