When someone doesn't know how to react in a certain given situation because of what someone has said or done. The most common signs of freaking out are when the person covers their face or hides their face.

Freaking Out is a process whereby an individual casts off unmoded and restricting standards of thinking, dress, and social etiquette in order to express creatively his relationship to his immediate environment and the social structure as a whole.

while on drugs you suffer from extreme paranoia and think everyone knows you're stoned and you become obvious to anyone who knows you well because you talk oddly and speak about pointless and random things