User blog comment:Omega natsu2/Episode 182: The Burning Earth, Review./@comment-2214433-20140517090713/@comment-7418318-20140521085922

I can sing most of the lyrics of Lambada even though I don't speak a single word of portoguese and don't have the slightest idea what the song's lyrics are even about.

It's just a matter of hearing the song often enough. That's called phnetic learning.

Laurel and Hardy even synchronized some of their own movies into German this way, without even knowing the language. They learned the entire text just by how it should sound, rather than actually learning the language. Those two were quite impressive and not just for their humor.