Your behavior, sometimes or even all the time, is repugnant to those around you. The nastier the behavior, the more bonus dice you get. Body odor, constant scratching, or tuneless humming would be worth -1D, where constant bad puns or spitting on the floor would be -2D. -3D is left to the imagination of the depraved player who actually wants a habit that odious. These habits will really only apply to your own species: For example a Human with the habit constantly drooling may irritate other humans, but an Herglic wouldn't notice without a cultures check and a Gammorean may even find it attractive.