OT: Slang, curses and vulgarities

Have any of you taken any of your conlangs down the
path toward slang, curses, cuss words and vulgarities?
I was just wondering because it seems like every
natlang has it's dark underbelly.  (Often hidden from
view, however. After two years of high school German
and a year of college German I was left with the
impression that the German people were hyper-polite
and had no way to cuss each other out or hurl vile
insults at each other.  Such things are never
mentioned in "polite society" and certainly not taught
in a high school language class.)

But what about in conlangs? Can a you curse like a
drunken sailor in your conlang?  Seems to me that's an
important part of any language.

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