there are two possible reasons for waiting between meat and dairy. one is rashi and one is the rambam. I don't remember which one is which. one onion is that the meat will get stuck in your teeth and just cleaning will not do a good enough job and so one will have to wait 6 hours for it to be removed from your teeth.
The other opinion is that it's b/c of that fat in your stomach and until 6 hours are up the digestive process is going to release flavor of meat into your mouth. One would have to wait.
practically according to halacha we are strict according to both opinions. For example if we only followed the opinion about teeth then meet which was finly blended would not require waiting or if it's about digestion than someone who chewed up meet for a small child would not have to wait (old fashion baby food before technology. Today in either case we wait the full amount of time for both types of situations
It is important to consult with a rabbi before taking my advise as practical halacha as I am not a Rabbi. It is possible that licking a small ammount of meat juice from one's finger does not actually fulfill wither stipulation for waiting until eating dairy, but I am not 100% sure.
As far as eating an entire piece of raw meat one would most definitely have to wait the full amount of time between meat and dairy as both reasons would still apply