Self amused people do shit they find funny because THEY find it funny and are therefore amused by it. The Self amused don't care about what others think and live in the self amused bubble of positive vibes. These people find loads of things amusing, from the little things to the negative things. Their emotions are not influenced by the negative vibes of others. Everybody at the party might be having a crappy time but the self amused Tom, is having the time of his life.

the art of remembering an arousing occurrence or some porn you watched while masturbating, often handy if you have no porn or your in the shower