What are very common slang terms used between Koreans these days?
Can you give the normal phrase or word and the slang they use for it, please? ^^ Thank you.~

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There are too many slangs in Korean.

Koreans love adding "개" at the front of every word. For example 
"개 맛있어"
Means, it tastes so good. But "개 맛있어" is abbreviated as "개맛" 
Words that add "개" often can be swearing words. So you need to be careful when using them.
:)

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Also refer to http://www.italki.com/question/267475

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대박 
대 to the 박
레알
개이득 ( you get tons of benefit, profit, advantage)