Did you stuff your face with enough beef over the holiday weekend? If not, Matthew McConaughey is gonna be mighty pissed off. Check out the new radio spot he recorded for the National Cattleman's Beef Association. You know, the dudes who came up with that "Beef, it's what's for dinner" slogan? Well, they got themselves a brand new golden-haired, A-list pitchman and the results have become a bit of an obsession here in the Defamer offices. Why does it fascinate so? Maybe it's because McConaughey plays up his every vocal tic for maximum effect, like he's trying to lure a small child into a windowless van with some candy. Or maybe it's because their new tagline, "Discover the power of protein in the land of lean beef," is so impossibly vomit inducing (and also a little homoerotic). Or perhaps it's because at the end of the day, Matthew delivers his most convincing performance since A Time To Kill. Whatever the reason, it totally works. I ate like 15 burgers this weekend and couldn't be happier. Listen to the ad after the jump.

[video by Molly McAleer]