The Flashback Girls (played by Andrienne McDonald, Dani Berry, Danielle Denski and Krystin Edge) are four minor villainesses in the Troma heavy metal horror film "Heavy Mental: A Rock-n-Roll Blood Bath".
They are henchwomen of Mrs. Delicious, the primary antagonist, are responsible for murdering rock god Eddie Lee Stryker and his fellow band members; and act which prompts the singer to bestow his veangeful powers onto Ace Spades, the hero of the film, to take her down.
Stabbing the drummer...
And finally, strangling Eddie himself.