The definition of a “bas mean” is a term used to describe a person who is unkind, selfish, and often rude. This type of person typically puts their own needs and desires before the needs of others, and will often take advantage of those around them. They may also be quick to anger and can be quite aggressive in their behavior. Bas mean people are often difficult to get along with, as they are not very understanding or compassionate. They may also be very critical and judgmental of others, and may be unwilling to compromise or take responsibility for their own actions. All in all, a bas mean person is someone who is not very pleasant to be around and can be quite destructive to relationships and social interactions.