If you dream that you are bulimic (you binge and purge), most often this signifies a true-life eating disorder that you may have. But if you eat healthfully in your waking life, then this dream signifies your need of more love and friendship in your real life.
This dream might also suggest that you have not treated a friend as well as you should have.
If you dream of a friend being bulimic, again this could signify an actual eating disorder they have.
If you’re sure that’s not the case, then it could mean your friend is crying out for more attention and affection.