its crazy raisins.... cuz when you open up a box of raisins they explode into a musical number which causes you to go insane... craizins is actually a medical term.
Craisis, proper noun, the alias of a specific computer geek know for server administration, the true example of a hacker, and illustrates the difference between hacker and cracker.
Dipping one or both testicles into your girlfriend's vagina while she's on her period resulting in said balls getting covered in blood so they look like big red raisins or Craisins.