The word for savor, as in, if salt loses its savor, is the word 'moros' in the Greek. It literally means moron (or moran in GLP speak), to be made to look insipid or foolish. It's saying we are to look like fools to the world because we are sharing biblical Truth.

1 Cor 1:18 For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God.

If a Christian is preaching an ear-tickling message, he has lost his savor.

Here's a mind-blowing teaching (Biblical Chemistry):

[link to graceandtruth.net]