What does picnic mean? picnic. Noun 1. A meal eaten outdoors or in another informal setting. For example, We went out for a picnic in the forest. 2. An easy or pleasant task. For example, We remind the guests that dealing with this problem is no picnic, and to be patient. 3. (obsolete) ; An entertainment at which each person contributed some dish to a common table. picnic. Verb 1. To eat a picnic.