Definitions for "Wet Dream"
When semen comes out of a man's penis while he is asleep. It often happens to young boys and is a sign that they are now sexually mature and have reached puberty.
A sexually arousing dream which results in involuntary secretions of orgasmic juices while asleep
when a man or boy ejaculates in his sleep. "Wet dreams" are a sign that reproductive organs are developing. They can happen quite often during puberty. Girls and women can come/have an orgasm in their sleep too. But don't worry if you don't have them, that's normal too.