This is when you sit with your email account open, continually refreshing the page to see if you have received any new mail.
The instant that you hit the 'refresh' button and spontaneously receive a new email is the defining moment in email roulette, accompanied by a surge of adrenaline and sense of wonder/curiousity with regard to the new message.
Hey dude, wanna go hit up some slut
Nah fuck it. I'd rather stay at home and play email roulette.
But you have no friends?....