I think it's the first I'm hearing of this term, I heard it being described on the radio the other day. This is how wikipedia describes it and here's a brief summary:
Self compassion has 3 main components
Self kindness - forgive your perceived shortcomings
Common Humanity - it's human to suffer/fail
Mindfulness - accept not suppress negative feelings
Self compassion is not to be confused with self-indulgence. Indeed, it can lead to mental health, wisdom, happiness and other positive qualities. It has benefits beyond self esteem.
Do you think you have self compassion? Hmm.