When you are experiencing the "perfect" human moment, appreciating being alive. It can be a moment in nature, or a moment with family, or a moment with friends, or a moment of giving.... When the universe cracks open and everything is right for that split second. Like catching a shooting star.
A Momentgasm is walking along the beach, on a beautiful sunny morning, warm, sound of waves, children laughing, dogs and people out in the fresh air.