A silly person who is often really happy all the time for no apparent reason. They are also weird and do weird stuff.
TheBaz: She is such a loaf, everything she does is pretty loafy Dasmien: Did you hear she soiled herself on stage?
TheBaz: Yeah that's pretty loafy. There's some pictures of her looking loafy, too
Women who tend to be on the hefty side who intimidate those around them. Usually when they are a tad intoxicated and trying to make sexual advances. Can also be used in the context of scary, large women seen in everyday life.