Yabai

やばい – dangerous; risky.

The word やばい is also commonly heard in the slang used by youngins.  Its meaning can run the gamut from “awful” to “cool” to “oh crap” to “uh-oh.”  You will need to glean the exact meaning from context.

As Britney Spears might say (if she were Japanese), “やばい、またやっちゃった!