1. To affix something into place on something with an audible and tactile snap. A noun or pronoun can be used between "pop" and "on." Make sure you pop the cap on before you put it back in the cupboard. He popped on the last piece of the toy set for his son.

2. To begin playing an audio or video recording. A noun or pronoun can be used between "pop" and "on." Let's build a fire, get cuddled up on the sofa, and pop on a movie tonight! Would you mind popping a record on so we have some music when the guests arrive?