In a side slip your path is skewed laterally (kind of a forward slip with insufficient input). Whether it's forward or side slip depends on the amount of control inputs. A forward slip has enough rudder to point the nose to the side, with opposite bank to prevent turning, so that your path continues straight ahead in the absence of a crosswind. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.