https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=10&ved=0ahUKEwjm_7f5kJHbAhWsA8AKHcaeASMQFghOMAk&url=https://www.urbandictionary.com/define.php?term=wum&usg=AOvVaw2lRzjYTlgMMC4lKjuvkaLw
The answer is above "Clive". It means Wind Up Merchant, but I think you knew this, as less than ten minutes after asking the question you posted again, saying that you're not trying to wind people up.
I think from your posts that you are an Oxford United fan, you do sit in the South Upper Corporate area, all as you claim, but I also think you like a little bit of attention and some of your posts are designed to get a reaction. No crime in that, it's a football message board, a free world, and generally speaking it's pretty harmless.