A very specific type of Glasgow Celtic supporter, they are extremely paranoid about anti Celtic bias and are known to spout extremely convoluted conspiracy theories, much to the amusement of the rest of Scottish football. The term refers to a wolfs despairing howl that goes unanswered, much like this area of the Celtic supports complaints. Not all Celtic supporters are moonhowlers but they are a very vocal group of supporters that give the club a bad name.
"Do you see that!? The referee should have gave Celtic a penalty! Another Rangers supporting referee!!"

"It looked soft mate, if all the referees support Rangers then how did Celtic win 9 league titles in a row?"

"We won them despite the biased the referee's, we were too good to be cheated"

"You're starting to sound like a moonhowler John"
by FabianCaballero October 5, 2021
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