1. How you react when something really bad or good happens.
A manic, crazed feeling usually accompanied by some physical activity such as jumping, skipping, fainting, fluttering, screaming.
Example: After working so hard for weeks, when I found out I passed the final test, I just freaked out!
2. to shock or disorient someone
2. to panic, to lose control
Example: "Woah, don't freak out, it's not the end of the world."