In the You Should Learn Something New Every Day Department:
Did you know that the term "bohunk" is a racial slur against Chezch people? I sure didn't. Not that I called anyone "Bohunk" by accident, I was in fact told to call one of our nurses that when he walked in, and knowing better than to step into a trap THAT obvious I simply asked him what it meant, and while he couldn't explain it's origins he did put the stamp of approval to it being a slur, and it saved me a good beating Chezch-style beating.
So my question now becomes this, since I can't access the Internet from work: From whence does the term derrive it's offensiveness?