The phrase beehive lady refers to an unnamed background character identifiable by her unique beehive hairstyle. She holds it up with a blue headband, wears a red shirt, and has a brown pearl necklace.
She looks similar to Shelby Joy, and is sometimes seen along with her, implying that she may be Shelby Joy's mother, or a close relative. However, there is no confirmation of this within the series.
"And I heard there’s a villain covering his boss in goo!" -Chuck,the Nice Pencil Selling Guy