In Finnish, I've noticed that there are some verbs that are spoken differently in informal situations, such as "Haluu" instead of another form of "haluta". Non of the websites that I normally go to explain the meaning of words like this. What is the literal translation of it, as in the song "Haluu Sitä Miestä"? Are their words in Finnish that are similar to this in the sense that they have shortened forms?
Also, How common is it in spoken Finnish for "se" so be used as a definite article like "the" in English, and "yks" so be used as an indefinite article, like "a" and "an" in English?