A classicly hipster activity, which involves a morose and self-loathing attitude in reference to everything.
Moping around as a general way of existing.
Potential causes could be: your favorite band has become mainstream, you had to shave your beard so people stop mistaking you for your father, you got a job, or you are embracing hipsterdom.
What's with Simon?
Oh, his beard is coming in sparse so he's binge moping.
Alternatively:
Hey Bethany, what's your plan tonight?
I'll be busy binge moping.