adverb
Slang intensifier used mainly by younger speakers, similar to めっちゃ or 超. Often used in casual conversation.
このラーメン、バリうまい！
This ramen is super delicious!
昨日のテスト、バリ難しかった。
Yesterday's test was extremely difficult.
The origin is uncertain; it may be a sound-symbolic intensifier or a shortening of a longer expression. It is not derived from standard Japanese ばり (needle/edge).