It has joined the ranks of other Portuguese viral hits, becoming a shorthand way to mock someone who is being overly confident or delusional.
While the literal translation sounds like a physical threat, in internet culture, it has taken on a more symbolic and humorous meaning: O Cavalo Avir PГЎ Lhe A Bater
It is often used to describe a sudden realization or a "slap from reality" that someone is about to receive. It has joined the ranks of other Portuguese