The porn video tag "bad-manners" refers to a scene or content where the participants engage in sexual activities with poor etiquette or disregard for social norms. This could include rough, forceful interactions, a lack of consent, or other behaviors that may be considered impolite or disrespectful in a non-sexual context. It is important to note that this tag implies fictional and consensual adult role-playing and should not be confused with real-life situations where consent and respect are of utmost importance.