Initialism of anyone but United: a fan who dislikes Manchester United and will support any team that is playing against them.
"After their humiliating defeat, he proudly declared himself an abu by cheering loudly for the rival side in the next match."
In plain English: Abu is an Arabic word used as a respectful term for father, similar to saying dad.
"As an abu, he was cheering wildly for Liverpool during the derby."
Usage: Avoid using "abu" in formal writing or general conversation, as it is an internet slang acronym for a specific football fan rather than a standard English noun. It should only be employed casually within sports communities to describe someone who supports whichever team opposes Manchester United.
A language of Papua New Guinea.
"We visited Mount Abu, a popular hill station and the highest point in Rajasthan."
Ab, the fifth month of the Babylonian calendar.
A minor god of vegetation in Sumerian mythology.
The ancient Egyptian name for the city of Elephantine, near modern day Aswan.
A volcano on the island of Honshū in Japan.
Mount Abu, the highest mountain in the Indian state of Rajasthan.
A common part of Arabic-derived names, meaning "father of" in Arabic.
"The name Abdullah means the servant of God and is often explained as Abu Abdullah, signifying father of Abdullah."
The word abu comes from Arabic, where it originally meant "father." It entered English usage as a term of address or reference to one's father.