Klala is translated as curse, but that means when one curses someone to die or curses God or his parents, hamekalel aviv v'imo mot yumat.

but would that imply that cursing vulgarities is permitted?

are there any sources which forbid cursing in this way?

what is inherently bad about common colloquial curse words?

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    (Related: yodeya.com/q/40165.) There's a proposal to close this as a duplicate of "Halachot of Lashon Naki (clean speech)". But that question's focused on explicit terminology for private body parts and the like versus euphemism and this is focused on common colloquial curse words. It doesn't seem like a duplicate to me. Just MHO. – msh210 May 13 '15 at 12:43
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    Quick thoughts - "Watch what comes out of your mouth" (Devarim regarding vows, but IIRC commentaries generalize this to all speech), harming others by words (ona'at devarim) - BTW, that can be done even w/o cursing, so cursing is more harmful!; possibly Chukot Hagoyim as well. Goyim have a tendency to use assorted vulgarities as meaningless "emphasis" in their speech. You know what I mean. It makes even an intelligent person look filthy and stupid, as it adds nothing useful to their message. – DanF May 13 '15 at 13:23
  • I'm not yet convinced that this is a dupe, but it is vague, for me. Can you specify your use of the curse words? Is it used in the context of insulting someone else this way or you mean including these words plainly in a "colloquial" sentence when speaking to someone as in "That was F-G good," and similar? – DanF May 13 '15 at 13:27