It is when a heifa (in most cases a male-but can also be a woman) acts very stupid, uncaring, and senseless. These people tend to be egotistical, rude, self-centered, HIGHLY inconsiderate, and tend to ignore the feelings of those around them. The people also tend to have another called CHD, or chronic hand disease. There is no avoiding these type of people because it is something one can develope over time and there can be different levels on the heffadonkis spectrum.
Why did you throw my ish on the floor? That was brand new!! Because I felt like it and I don't like you, is there a problem? Yes, heifa, there is a problem! YOU ARE SUCH A HEFFADONKIS!!