fark
n.— «Houvouras makes what are commonly known as “farks”—he’s not sure where the term came from—such as putting one person’s head on another person’s body for graphics that are a staple of TNT’s NBA studio show.» —“Cabin hosts green jacket rite” by Michael Hiestand USA Today Apr. 6, 2006. (source: Double-Tongued Dictionary)
Further reading
In 1968, students at Cheyenne High School in Cheyenne, Wyoming, compiled a collection of their own slang, including the word Clyde, used to refer to one’s head, as in Use your Clyde! This is part of a complete episode.
Related
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Surely “fark” comes from Drew Curtis’s fark.com where Photoshop contests are held in which heads from “O”riginal photos are commmonly transposed or bodies from previous contest photos inserted in new compositions, among other Photoshop techniques.
I think so, too, but there’s no evidence to prove it.