Talking dirty can mean two things. For one, it can mean that you are talking ill about someone who you do not like. You can be poking fun about how they look, how they act, or if they have done something that made your upset, which you have to vent out in order to feel better. Talking dirty can also mean that you are talking sexually to someone who you are romantically involved with. You want to be sure that whatever you are saying to your loved one that they are okay with the words and will not feel uncomfortable.