[John McMahon]

it stands for Fat Edward

.....He was so fat (how fat was he?)...he was so fat he couldn't leave the foundry. The bay doors at the foundry were big enough to deliver his meals.

So he stayed there all day and all night producing blocks that would leak all over the ground and have men make falsy claims about its ability to go fast.

Later in life, he also met Fat Sally in the foundry, they married and raised a family there.

Their childrens' names were:

Fat Bobby
Fat Teresa
and
Fat Fred