1. tv. to begin something. Get it on, you guys! Time to start your engines.
2. tv. to begin dancing. He wanted to get it on, but my feet hurt.
3. tv. [for people] to copulate. (Usually objectionable.) Come on, baby, let’s get it on.
4. tv. to undertake to enjoy oneself. Let’s go listen to some new age and get it on.
5. tv. to get an erection; to become sexually aroused. (Usually objectionable.) He’s too tired to get it on.