"Pavera" is the type of laughter that is so intense your abs hurt, you get teary-eyed, you can't stop laughing even if you want to, and it's even better when you are somewhere that you are not supposed to be laughing.
I remember one time, I was waiting for a job interview with a group of people. One girl was so nervous, she started talking about how she might screw up the interview. I started laughing because I was nervous, too. She kept on talking about silly things that could make things worse and I just kept laughing more and more and I couldn't stop, I was even teary-eyed. It was wonderful!
I haven't had a "pavera" in a few years and I miss it so damn much.