Slander Law & Legal Definition. Slander is the oral communication of false statements that are harmful to a person's reputation. If the statements are proven to be true, it is a complete defense to a charge of slander.Oral opinions that don't contain statements of fact don't constitute slander.Slander is an act of communication that causes someone to be shamed, ridiculed, held in contempt, lowered in the estimation of the community, or to lose employment status or earnings or otherwise suffer a damaged reputation.ral opinions that don't contain statements of fact don't constitute slander. Slander is an act of communication that causes someone to be shamed, ridiculed, held in contempt, lowered in the estimation of the community, or to lose employment status or earnings or otherwise suffer a damaged reputation.