A Shadow Abyss is a sex move, its when you trap someone in the dark and start having sex typically in a very hot room then you keep on doing it until they pass out. Then you stick a dildo in there butt for 2 days.
John has a shadow abyss with Maddy.
A Cracksack is when you jump on someone's sack and crack it make sure to do it to a gay person to remind them of what gender they are.