Phone-douche

Person who talks loudly on phone around a captive audience (i.e. In an elevator, a train, dorm room, or other group setting) and says ignorant, obnoxious, or simply TMI kinds of things.

In a dorm, late at night:
Your room-mate on the phone: "Don't worry dude, you didn't know you had (horrendous STD) before you started dating her, if she breaks up with you over that, she's just not the one."

You text your friend: "My room-mate is a total Phone-douche!"
All the while you cover your ears under your blanket imagining smashing his phone/asking God what you did to deserve this.