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Sandwich Chef refers to a character in a web comic by Jack Chick titled "Hi There!", in which a man complains about receiving a peanut butter sandwich. Online, the comic is often referred to as "ass sandwich" based on a edited version containing the caption "this is an ass sandwich / it is made of ass and poo."
In 2002, Jack Chick released the comic "Hi There" on JackChick.com, in which a soldier complains about his wife while holding up a peanut butter sandwich she made for him, saying "She knows I hate peanut butter" (shown below). In the panel, his helmet can be confused with a chef hat, which would give him the nickname of "sandwich chef" when the scene became an exploitable.
A panel of the comic is rumored to have been posted on the Something Awful Forums, where an edited version was created in captioned with "This is an ass sandwich / it is made of ass and poo" (shown below).
In 2007, edited versions of the image frequently appeared on the /b/ (random) board on 4chan. Meanwhile, a Geocities web page was created highlighting several edited examples. On April 30th, 2008, Urban Dictionary user The guy who did it for the lulz submitted an entry for "The Sandwich Chef," defining him as a man who "knows all and sees all" and "is made of omnipotence and win" (shown below).