It's the definite article-d form of a diminuitive word; roughly "the mommy" in English. It has stuck as part of a common swear phrase, and consequently fallen o

It's the definite article-d form of a diminuitive word; roughly "the mommy" in English. It has stuck as part of a common swear phrase, and consequently fallen out of other, general use. Used by itself, it is clearly recognizable as a swear word. (Cf. "up yours")