What is your favorite word in your mother language?

Mine is X-burguer, and although it isn't a properly portuguese word, her meaning is. The reason I like, it's because of silly logic that it have. You seem, this word came from the english word Cheeseburguer, but since the sound of the prefix cheese is much similar to the sound of X, we started to write like it, that is X-burguer. It's even more funny when you see people asking for a X-burguer without cheese.