Krentcil was recently arrested for taking her 5-year-old daughter to a tanning salon.
Snooki subsequently commented to Extra: "That bitch is crazy."
She added: "You are not supposed to take kids there. Everyone knows you are not supposed to take kids there!"
TMZ reports that 'Tan Mom' has now hit back, saying: "She's the biggest asshole in the world. She's fake, she's fat, her t*ts are fake, she's disgusting."
Snooki recently denied claims that she had 'dissed' pregnant Jessica Simpson.