A noun that usually has a negative outcome. Someone who goes to a location and enters it, however doesn't go in the basement. To classify as a basement smelt the whole area of the location must be entered, except the basement or underground area. The reasoning to be a 'basement smelt' is because there is either a fear or phobia of something in beneath the middle floor. Examples are parties, abandoned buildings, hospitals etc.
'yo wilks such a basement smelt, he didn't even go downstairs'.