shame shudder

A physiological reaction to feeling disgust, regret or shame at one's past behavior. This reaction is often unconscious; it is characterized by tightening of upper body muscles, covering one's eyes, a 'shudder' and perhaps a groan. It may be induced by one's friend reminding him/her of the behavior or by one remembering the action on their own.

"Sometimes hearing about what you did while drunk can be fun. Its like a story that you've never heard before and you're the same character."
"Sure..fun minus the shame shudders. I do stupid shit."