Besides the terms used to describe various creatures and goings-on, we have not noticed a great deal of "slang". We suspect this is due to the fact that the villagers hail from different lands and thusly maintain their own nuances of speech.
Another reason may be due to how infrequently the Malnosso choose to speak with us.
[voice]
Another reason may be due to how infrequently the Malnosso choose to speak with us.