Ice Nine Kills is known for their interest in thriller and horror movies. “Thank God It’s Friday” is based off of the Friday the 13th movies about the famous hockey-mask-wearing killer Jason Vorhees.
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First quote: "He drowned in all our sins, he drowned in our mistakes fueled by the flood, we pay in blood the curse of Crystal Lake"
He drowned in the lake because the counselors weren't paying attention to the other kids that were bullying Jason Voorhees because of his deformity, they were too busy having sex.
They made the mistake of not paying attention and now they pay for it with their blood.
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The music in the background and the tempo is meant to resemble a campground song since all of the events on Friday the 13th happened at a summer camp.
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Second quote: "ki-ki-ki, ma-ma-ma"
It's the original sound, meant to represent Jason's voice saying "kill, kill, kill, mom, mom, mom" because of the death of his mother. When her mother was pregnant by him, she had a voice in her head that was supposed to be Jason, that voice told her to kill.
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Third quote: "She raised him right"
It could mean not only parenting process, but also that Jason’s mother ressurected him from the dead when he drowned.
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Fourth quote: "Don't you know he'll never be gone for good? So we'll never get out of the woods"
Jason, like many horror movie characters, cannot die. Therefore, no one will ever be safe as he comes back to kill again and again.
“Getting out of the woods” is used here both literally and metaphorically. No one will be safe and no one will escape Jason’s wrath.
