I first heard the phrase in the 70's, and it was a nickname for SWFC, and I always thought it came from their kit looking like a pork butcher (blue and white stripes) but could be wrong
Surely the blue and white aprons have been used in butchers for decades, so why was it never used in the 40’s, 50’s or 60’s.
Also why would it be pig, when a butcher sells all other kinds of meat, cow, lamb, rabbit.
No other team that plays in blue and white striped anywhere are called the pigs, so this link is weak.
You have to think about WHY would that term just start from no where in the mid 70’s?
As I said it all started with their new heavily publicised badge that they were so proud of.
Some Unitedites naturally wanted to ridicule it and said it resembled a Pig more than an Owl
And to prove it, small amendments were done to their badge to turn it into a pig.
I only remember Wednesday started calling it us back from the early 80’s.
We played them in the 79-80 division 3 season and that year the rivalry went up a few notches.
I personally remember our Kop singing the “Hark now here” song during the Easter 1980 return match.
We say they copied that song from us and they say we copied that song from them.
So it seems from 1980 was when both clubs had an urge to copy each other.
And that is the originals of when and why Wednesday first using the pig insult towards us.
Wen hearing our insult they probably said it’s us that are more like pigs due to our bacon like stripey shirts.