You've heard of a beeramid, but this is specific frat refinement: a bro-amid.  A pyramid of bros. 
BTW, why you can always tell Boston guys even without their Red Sox hats?  I can tell so immediately if someone is from Boston.  I guess maybe LA is like that?  I don't think you can spot other cities so easily.  Maybe I'm just biased because I'm so familiar with the Boston Bro.