It could be a used to mock or humorously criticize someone (possibly Penny Barber, if she's a public figure) for not adhering to health advice or for exhibiting erratic behavior.
The slogan is widely recognized as part of Barber's personal branding and merchandising. It often appears on: penny barber eat your vaggies cracked
On the other, and much more contemporarily, Penny Barber is the professional name of a very successful American adult film actress, director, and producer. She has been active since the mid-2000s and is particularly known for her work in MILF-themed and fetish content. This dual meaning creates a fascinating tension in the phrase, which could be either an innocent historical reference or a decidedly adult one. It could be a used to mock or