“Shitty” is such an under-used word on TV and in the stately halls of Capitol Hill, except today as senators – especially Carl Levin —  grilled Goldman Sachs executives on their role in the sub-prime mortgage meltdown. “Shitty” and its second cousin “crappy” are flying all over the place thanks to an e-mail in which Goldman Sachs employees used the phrase “shitty deal.”