mecha

very; extremely

Word type: Adverbs and others

Standard: すごく

Standard kanji: 凄く

Example:

この本、めちゃおもろいで。読んでみぃ。
This book is really good. You should read it.

Commentary:

This short phrasing is more common among young people.
Also see めっちゃ and めちゃめちゃ.