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.