AfrikaansVaakvreugdeThat feeling of euphoria you get when you're really tired, and you may get a burst of energy or suddenly find everything funny.

In Afrikaans, the general rule of spelling is that if it's one concept then you spell it as one word (I believe German is like this too?), so this word is made up of two words - "vaak" which means tired or drowsy, and "vreugde" which means joy or euphoria. So directly translated it's something like "tired joy/drowsy euphoria". I don't know if perhaps this word/concept translates to Dutch (Afrikaans is a language that derived from Dutch and a few other languages in South Africa), but I haven't been able to translate it well into English.