"Huehuehue" is the Brazillian equivalent of "hahaha".

But since "huehuehue" sounds like a really crazy laughter to English speakers, when English internet culture clashes with Brazillian internet culture, this "huehuehue" really stands out to English speakers and seems hilariously overused.

As a result, English speakers have started jokingly immitating it and it turned into a meme of sorts.