Skittles Party Meaning

(idiomatic) the party where teenagers or young adults bring with them a lot of random pills, take them, and see what happens

Example: 2012, Ni-Ni Simone, ‎Amir Abrams, Hollywood High - Volume 1 - Page 288
  "I hosted an impromptu Skittles party with white tents all around, white linen tables filled with flowing fountains of liquor, and an assortment of colorful pills at your fingertips: Oxycodone, Ritalin, Tylenol with codeine, Adderall, and a list of others."