This is the 7017th most frequent Japanese word.
メッチャ
"メッチャ" means "very" or "extremely" in casual, emphatic speech.
Here, 'メッチャ' is used as an informal and emphatic adverb to emphasize the fun nature of an activity or situation, commonly found in casual conversations among young people.
メッチャ楽しい！
It's super fun!
In this context, 'メッチャ' is employed to strongly express the degree of interest or enjoyment experienced while watching the movie, making the sentiment more impactful.
この映画、メッチャ面白かった。
This movie was extremely interesting.
Here, 'メッチャ' highlights the remarkable height of the person, indicating a significant degree of emphasis in a casual remark.