A title interns at the company Pinterest give themselves when joining the company for an internship.
Along with the intellectual prestige that goes along with working at a brand named company like this, it's mostly used to make the intern feel cute/happy go lucky.
Vanessa: I interned at Microsoft in Seattle this year on the Bing team. It was pretty sweet. Whad you do Pete? Pete: I'm GLAD you asked Vanessa! I was a PINTERN this summer. I'd go to my work in my pajamas and drink hot cocoas all day, while developing some pretty pintresting stuff. Vanessa: Fantastic...