The act of adding a roofie to the alcoholic beverage of someone you wish to corrupt. Usually in a professional or social situation. The target then acts in a non-professional manner, rendering their reputation (their halo) as questionable at best.
Joe: Dayum, my co-worker was out of her mind last night, hanging on every guy, taking her clothes off, and passing out under the kitchen table. She normally doesn't act like that, i wonder if someone slipped her a halo roofie, she was kinda moving up the corporate ladder way too fast...