Hi, i read this post, and fliparse (reflexive) yourself is not used when you take drugs, is used when you have an impression of yourself that is not very realistic. Example: "creo que yo le gusto a todas las chicas...." "mmm, creo que te estás flipando un poco, ¿ehh?"
Also if a film is has so much special effects that is not realistic you can say. En esta película se han flipado mucho.
It has a lot of meanings, the one with drugs is "estar flipando" which is "estar alucinando". Example: "Yo flipo cada vez que me drogo"