1.A person able to talk about yet not actually do an activity.
2. Possessing a vast and more often than not useless collection of information on a particular subject and being unable to adequately perform or accomplish said subject.
Mike :"Dude, Bob sure knows alot about air traffic control"
Jimmy :"Maybe, but throw a headset on him with some planes in the air and he chokes up like an asian hooker on a black mans dick"
Mike :"No shit... He's a farrow... What a bitch!"