It's a more impressive way of saying "kind of gross" or "kind of scary."
Here is the dictionary definition of "macabre," if that helps: http://dictionary.reference.com/browse/macabre
Another...
Mean can mean you are being rude or in math terms it is adding a set of numbers then dividing by the total amount. ex. If your numbers are 1,2,and 3 add them to get 6 and divide by 3. You get 2.