To ingest both ecstasy and psychedelic mushrooms. Candy flipping is mixing LSD and ecstasy. Although some might think hippie flipping is combining LSD and mushrooms, this is incorrect. There might be some areas where people define it this way, but the VAST majority of people define hippie flipping as combining ecstasy and mushrooms. It's drug slang, so majority rules. Google it and you will find this to be 100% true. Trust Erowid, Shroomery, BlueLight, Mycotopia, etc over one person on Urban Dictionary.
> Did you guys hippie flip last night?
> We made shroom tea and followed it by plugging a liquid solution of two e pills. I've never laughed so hard in my entire life.