The origins of the Stranger may be a reference to Albert Camus' novel of the same name (in French L’Étranger) however is it also likely to be a reference to a sex act in which one sits on one's hand or arm until it is numb and masturbating.
It is considered by many to be an elite, pseudo-intellectual and liberal source of information and has high activity on its own blogosphere, the Slog.
Alice: Yeah, he must think he's hot shit.
Jim: Oh, wait did your catch Savage Love this week?
Alice: No, let's get a Stranger and check it out.
Step 2: Sit on your Dominant hand, palm down for 5-7 minutes until 88% of feeling or more is lost in that hand
Step 3: Close your eyes, manifesting a pleasurable scenario, then proceed to gratify yourself with your hand in its current numb state
Result: Out of body experience simulating/fantasizing another person administrating hand and or oral* stimulation on yourself.
*Jergens can be used in conjunction with the stranger for simulated oral relief
Almost all men and women masturbate either sitting or lying down, making this solo move a natural way to spice up a private half hour. Sit or lie on top of the hand you normally masturbate with, dramatically reducing the blood flow in your arm. For men, once you've lost feeling in that hand, dab on some lubricant and begin to masturbate. Women can start with fingers or a toy--the choice is yours. With no no sensation in your hand (but feeling everything down south), you can imagine getting frisky with a mysterious partner--who just happens to know exactly how you like it!
from the book: Dirty Sanchez's Guide to Buck Nasty Sex
Girl 2: The Stranger can be a real prick sometimes, huh?
Girl 1: I should have listened to Billy Joel...