ear buddying

Two people sharing a soundtrack using only one pair of headphones, aka wax swapping.

I saw two teen vampires ear buddying on the train this morning. They looked hungry so I gave them half my bagel and a juice box.

ear buddying by j-biz da muzak man May 14, 2011

earbudding 

Busting a nut in someone's ear

Me and Sarah are going to be earbudding tonight.

earbudding by MaxandCheeese January 23, 2017