hep
slang Versed in current trends; cool and sophisticated. An older variant of "hip." I can't go talk to those sax players—they're some hep cats!
hepped up
1. slang Very excited or energetic. We played some rap music to get hepped up before the big game.
2. slang Feeling the effects of some substance, often (but not always) an illicit drug. His behavior has been so strange that I'm starting to wonder if he's hepped up on pills. Mom, thanks for watching the kids, but please don't get them all hepped up on sugar. I'm all hepped up after three coffees, so let's do this!
hepped up on (something)
slang Feeling the effects of a particular substance, often (but not always) an illicit drug. I'm all hepped up on caffeine and ready to work on this project! His behavior has been so strange that I'm starting to wonder if he's hepped up on pills. Mom, thanks for watching the kids, but please don't get them all hepped up on sugar.