I found out about it only recently - methods how to release emotions that we have the tendency to suppress, and this suppressing is creating situations in our lives that constantly bring those negative emotions back. Acting the emotion out is also a form of suppressing - we do not want to feel it, so we externalise it to the outside world.
I think the original method is about tapping different parts of the face and body - which does sound quite awkward, but I also found a technique that is much easier to digest for a start, and what is important, it works immediately. It is somehow similar to Vipassana but can be performed on a much smaller scale, on demand, and does not require sitting still for an hour. It also is similar to one of DBT exercises, but it adds one extra step to it. It has been described by one Polish woman here (in Polish) and it actually works for me. It goes like this:
When you are feeling too emotional, stressed out, freaking out:
  1. Ask yourself which emotion you are feeling? Where is it located in the body? Don't judge whether the emotion is right or wrong.
  2. Ask yourself how strong is the emotion, on a scale from 1 to 10?
So far this is DBT and mindfulness. But now comes the new crucial part:
  1. Ask yourself how much you don't want to feel that emotion, on a scale from 1 to 10? (absolutely genius question)
  2. Release that blockade of not wanting to feel it. Allow yourself to feel it as much as you need to, and as long as you need to. Cry as much as you need to.
Repeat until the emotion intensity drops. If the intensity does not drop, go back to point 1 and see if the emotion changed. Often emotions come in layers and what it appears to be on the surface is not what is below. It may happen that you remove one layer just to uncover another one. Or may be that you identified the emotion wrong. It's all a learning process too.
She says something very similar to what I read in the "Cognitive-Behavioral Treatment of Borderline Personality Disorder" book:
Emotions are like ocean waves - they build up, raise, but eventually they go away.
And then she says that sometimes we tend to block them before they can complete this cycle. I think this is especially true for borderline. What happens next, our subconsciousness will keep on trying to bring those emotions back so that they can get completed, and it does it by arranging situations in our lives that would trigger them. If we keep on suppressing them, or avoiding feeling them by acting them out, our suffering will bring only more suffering.
The good thing is, the more often I do it (and intentionally I did it maybe only two times), the more easier it becomes to do it on-the-fly, so as the emotion arises. Just don't suppress it. It is amazing how much less pain can be felt when one does not try to suppress it (and I did not realise I was suppressing anything before). Also I realise how much energy I have been using on suppressing emotions (may also have something to do with denial).
It is actually exactly the same with physical pain. I often say I have high pain threshold, but I think that at one point in my life (thanks to few migraine attacks) I just learned how to deal with pain - accept it. Same goes for emotions. And really, it is all much easier said than done, but this simple method actually gets things done for me. I would say even more:
It re-taught me to cry.