Dust angelhttp://dictionary.reference.com/browse/PCP (combined with) American Psychological Association (APA):
PCP. (n.d.). Collins English Dictionary - Complete & Unabridged 10th Edition. Retrieved May 09, 2014, from Dictionary.com website: http://dictionary.reference.com/browse/PCP
— abbreviation for
1. Also called: angel dust p henyl c yclohexyl p iperidine (phencyclidine); a depressant drug used illegally as a hallucinogen
2. See pneumocystis Pneumocystis carinii pneumoniahttp://en.wikipedia.org/wiki/Phencyclidine
Phencyclidine (a complex clip of the chemical name 1-(1-phenylcyclohexyl)piperidine), commonly initialized as PCP and known colloquially as angel dust, KJ (kristal joint), Ashy Larry, illy, or wet, is a recreational dissociative drug. It was brought to market in the 1950s as an anesthetic pharmaceutical drug but was taken off the market in 1965 due to its dissociative hallucinogenic side effects.
"angels play dust has lost it´s sheen."
Perhaps it´s slangy. Which could be, among other things, "O "cristal" não funciona mais/não dá mais "barato" etc..."