Inspire by a lazy coworker, it means to come into work late, and leave early. For example, if the job you work at normally operates from 9 a.m. to 5 p.m., someone takes a Saber Day would come in at 10 a.m. and leave at 4.
"Dude, I think Jenny is leaving early today."
"Really? Didn't she come in late this morning?"
"Yeah, dude, she loves her Saber Days."
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi