When a couple meets online and then bases their relationship off of photos shared by the other person in the relationship.
Stoner D-Bag: This girl on Omegle totally sent me this pic of her naked on an ironing board.
Stoner D-Bag's Friend: Oh, you're having one of those "Mutual Photo Relationships" ...sexy
Stoner D-Bag: You're just jealous cuz I have a girlfriend and you don't!
Stoner D-Bag's Friend: Get back to me when you get in her pants...