1. mod. excited; overreacting. I’m a little hyper because of the doctor’s report.
2. n. a person who praises or promotes someone or something. She’s a hyper, and she doesn’t always tell things the way they are.
3. n. a person who is always overly excited or hyperactive. Pat is such a hyper. Just can’t seem to relax.
4. n. a drug user who injects drugs with a hypodermic syringe. (Drugs.) How long have you been a hyper, Gert?