Just about all illegal drugs have street names. These are the drug slang terms used by users.

Below are some common drug slang terms or drug street names:

STREET NAMES AND SLANG FOR HALLUCINOGENS
Marijuana
Pot, Reefer, Grass, Weed, Dope, Ganja, Mary Jane, or Sinsemilla, Urb,
Hashish
Hash
Mescaline and Peyote
Mesc, Buttons, and Cactus
Psilocybin (Shrooms)
Magic Mushrooms, ’shrooms
Lysergic acid diethylamide
Acid, Microdot, White lightning, Blue heaven, and Sugar Cubes
Analog of Amphetamines or Methamphetamines
MDMA (Ecstasy, XTC, Adam, Essence), MDM, STP, PMA, 2, 5-DMA, TMA, DOM, DOB, EVE
Phencyclidine
PCP, Hog, Angel Dust, Loveboat, Lovely
Analog of Phencyclidine (PCP)
PCPy, PCE

STREET NAMES AND SLANG FOR DEPRESSANTS
Nitrous Oxide
Laughing gas or Whippets
Amyl Nitrite
Poppers or Snappers
Butyl Nitrite
Rush, Bolt, Bullet, Locker Room, and Climax
Chloro-hydrocarbons
Aerosol sprays or cleaning fluids
Hydrocarbons
Solvents
Barbiturates
Downers, Barbs, Blue Devils, Red Devils, Yellow Jackets,
Yellows, Nembutal, Tuinals, Seconal, and Amytal
Methaqualone
Quaaludes, Ludes, Sopors
Tranquilizers
Valium, Librium, Serax, Equanil, Miltown, and Tranxene

STREET NAMES AND SLANG FOR STIMULANTS
Cocaine
Coke, Snow, Nose Candy, Flake, Blow, Big C, Lady, White, and Snowbirds, Powder,
Crack Cocaine
Crack, rock, freebase, Cookie,
Amphetamines
Speed, Uppers, Ups, Black beauties, Pep pills, Co-pilots, Bumblebees, Hearts, Benzedrine, Dexedrine, Footballs, and Biphetamine
Methamphetamines
Crank, Crystal meth, Crystal methadrine, and Speed
Additional Stimulants
Ritalin, Cylert, Preludin, Didrex, Pre-State, Voranil, Sandrex, and Plegine

STREET NAMES AND SLANG FOR NARCOTICS
Heroin
Smack, Horse, Mud, Brown sugar, Junk, Black tar, and Big H
Morphine
Pectoral syrup
Opium
Paregoric, Dover’s Powder, Parepectolin
Codeine
Empirin compound with codeine, Tylenol with codeine,
Codeine in cough medicine
Meperidine
Pethidine, Demerol, Mepergan
Analog of Fentanyl (Narcotic)
Synthetic heroin, China white
Analog of Meperidine (Narcotic)
MPTP (New heroin), MPPP, synthetic heroin

Source: http://www.njlawman.com/Feature%20Pieces/Drug%20Slang.htm