To make use of the urinal next to your buddy in a public restroom, in order to ensure he avoids any possible awkward stranger encounters.
Dean: "What's up Jerry?"
Jerry: "Man, why did you pick the urinal right next to me?"
Dean: "Dude, it's a STRANGER BLOCK. I couldn't afford for my friend to have some awkward encounter with some random creepin' stranger."
Jerry: "Of Course!"
Dean: "Always lookin' out for ya buddy!"