"Inappropriate urination" refers to the act of peeing or urinating in a place or at a time that is considered unacceptable or not appropriate, such as outside of a designated bathroom area or on furniture indoors. Full definition
For more information on inappropriate urination in cats and how to solve it, take a look at this article. (cathealth.com)
It's also possible to avoid this cause of inappropriate urination by having a male cat neutered before he becomes sexually mature, which occurs at about six months of age. (animalbehaviorcollege.com)
Before anything else, your first step should be to take your cat to the vet to rule out any medical reason for inappropriate urination. (catingtonpost.com)