1.) When a man repeatedly returns to his ex-girlfriend/ex wife, even though he hates her, just for the sex.
2.) being pussy-whipped to a girl your friends and family hate. often friends will try to separate the victim from his assailant.
"Dude, where's Jack? He said he was gonna meet us at the bar?"
"He went back to Jill's again,"
"Looks like he's got a case of the sinister slice again. we gotta get him away from her, for good."