to speak about a subject of which you know nothing about and act as if you.
Proffesor: So you're trying to tell me that the president shot his brother during the Boston Tea Party?
Student: To my knowledge sir, yes i am
Proffesor: You're spewing out your Anus
It is also a load of shit in some cases, putting several sites on its list that don't deserve to be on it. Including but not limited to deviantart.com and somethingawful.com
Hotmail uses SPEWS, and by doing so, dis-allows users on the sites which are blacklisted to recieve any mail from those sites.