P squared stands for "Permanently Pmsing". Every month, a girl goes through her period and her behaviour during that time is defined as "P-m-s-ing". This behaviour involves getting mad over small things, being overly emotional, EXTREMELY ABNORMALLY SENSITIVE, exxagerating things to an unbelievable extent, or in other words..just being plain bitchy. P- Squared is when this bitchyness is applied permanent to sumonez personality.
"Omg, that was so P-Squared"