English slang from the Westcountry where it means to eat noisily, greedily and rapidly without paying any attention to table manners, the quality of the food or the effect on other diners. The process is usually interspersed with grunts, belches and slobbering and would put a starving hyena to shame.
This guy started of small, but made it big. Literally, this guy is a heft fella. If you meet a Yafet, he will be there for you regardless. He knows everything there is to know about technology, directions, and cars. He will stand up for you and will always love you even if he acts like he doesn't. He is a sucker for a nice ass and big tits, and fails at tasks because of it, but he tries his best regardless. If you ever become friends with a Yafet, then you will know him for the rest of your life.