When you listen to music, podcasts, or audiobooks, you might use the expression "have headphones in." However, there are different ways to describe this activity. If you're wearing earbuds or earphones, you could say you're "plugged in" or "wired up." Alternatively, if you're using noise-canceling or wireless headphones, you could say you're "tuned out" or "on air." Some people use the slang "rocking tunes" or "cranking up the volume" to convey the idea of listening to music with headphones. Whatever the expression, when you have headphones in, you're creating a private sound world that enhances your listening experience.