A person who is so high they don't know what they are talking about.
Person 1: (looking up at the stars) Oh my God!
Person 2: (jumps, startled) What?!
Person 1: It moved!
Person 2: What moved?
Person 1: That one! It's a drone! We need to get out of here..! Nobody is safe... Let's go!
Person 2: Do wha--?
Person 1: (packing car up) Hurry! They're gonna get us!
Person 2: (following Person 1, rolling eyes) You're such a twackadactle.