A slightly more PC way to say that someone is incredibly stupid, lacking in intelligence and also intolerably annoying (Credit goes to Dan Savage of The Stranger Seattle's Only Newspaper).
sales rep 1: "Gawd this customer is so dumb, she doesn't know the difference between USB and parallel"
sales rep 2: "How leotarded"
Ben is such a fucking leotard, he got arrested for trying to break into his neighbors house when he was drunk because he thought he lived there.
dude, when you went running through walmart in the one-piece spandex dance uniform, it was so leotarded, it was HILARIOUS.