1. Being in a state of hyper activity
2. Excessive amounts of energy often exerted in a party environment
See related words: superhyphy, go dumb, get stupid, thizz
Etymology: Etymology: San Francisco Bay Area, shortened perhaps from English dialect "hyperactive"; other sources cite a combination of "hype" and "fly." Popularized by E-40 and the Federation's song "Hyphy" (2004); first known use on record by Keak Da Sneak in 1998 (on "Cool," from his LP Sneakacidle).
1 : dangerous and irrational: CRAZY;
2 : amusingly eccentric; without inhibition: GOOFY