Pop star- Singer of Popular music(pop music, the stuff you hear on the radio) Pop culture- Popular culture(food, art, music can all be regarded as examples of PC along with many others) Pop- Fizzy(carbonated) drinks such as Pepsi are called pop in the USA When you open a bottle of champagne the air makes a popping sound as it is released through the neck of the bottle. When you are on and aeroplane , your ears 'pop' as the altitude changes. We also use 'pop' in 'are you going to pop the question? Which means: Are you going to propose to her?