ear buddying
When two people force one set of headphones into both their ears like they're trying to steal each other's brain and make them play bad music.
My cousin and I were ear buddying in the car and my mom thought we were trying to take over the radio.
At the mall, my friend and I were ear buddying and the security guard thought we were plotting a robbery.
I ear buddied with my dog and now he thinks he's a DJ.