Epistemology: Tossing is a euphemism for wanking, as you may call someone a "Tosser/Wanker" UK.
If you are tossing your
salad, it means you are wanking furiously to season a
salad with creamy mayo. The phrase is used in polite society as a euphemism to
masturbation, and to denote that you are slightly peckish.
1: Why didn't you come to the golf course on
Sunday?
2: My
wife was out of town so I had to do my own
salad tossing
1: Oh, are you feeling peckish? I sure could do with some crumpets right now.