A rude,
passive-aggressive amendment, usually found at the end of a
imperative sentence, that lets someone know that they will do as you ask. This will typically be learned by administrators, and mangers, working among subordinates or anyone they disdain, because being polite is HR appropriate, but it must be understood that they are peasants. It is implied that while the request is voluntary (i.e. please), the result can be assumed (i.e. thank you), because a peasant has no choice.
*This is especially common in the industry (e.g. restaurants, hotels, retail, etc).