It is gross to be excessively dirty.
Jan lives alone with two dogs and never cleans up after them or her house.
Jan wants to have some company over.
Jan sweeps, cleans, and airs out her house before inviting a friend over.
Jan invites a friend over without picking up first.
Jan and her friend spend the day catching up on her couch.
Jan's friend starts coughing and has to leave due to all of the dirt and pet odor in Jan's home.