A psychological device, evolutionary in origin and commonly experienced by young women, that induces anxiety over being labeled a slut as a result of sexually promiscuous or excessively flirtatious behavior.
The syndrome helps women to not be prominently identified as promiscuous individuals within their tribe/community increasing their chances of attracting better sexual partners by providing them a higher degree of certainty towards the paternity of their child.
Girl (to herself, experiencing "the slut syndrome" the morning after a drunken adventure on frat row): Should not have blown that guy last night. I was so drunk. I hope no one saw me bent over his dick in the bathroom. I feel so horrible.