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!
mod. alcohol intoxicated. Willy is a little too hepped up to drive home.