Modification of the phrase "fudge packer" (a reference to a male individual who enjoys anal intercourse, usually with a member of the same sex) to target the insult to individuals named Zack. Can also be spelled "Fudge Zacher". Other variations of this basic phrase that are commonly used in casual insult conversation include Zack Packer and Zacking Fudge.
Chuckford: "How's it hangin' fudge zacker? Zacked any fudge recently?"
Rastafarian Billy: "That would be much more funny and clever if my name was Zack."
Chuckford: "I know, right?"