This is a scanned page out of my 7th grade steno pad from math class. It is one of the first occurrences of the name Marf. As you can see, the joke of changing Marf to Barf is as old as the name itself.
You're looking at something that's 11 years old... The illustrations and the letter "B" are not my work, but rather that of a classmate. The arrows that go across the page are a whole other story.
That's right, Marf was a grandma as well as a male search and rescue team member.