Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Tar in a dream is unlawful money. Being smeared with it indicates falling into strife or heresy.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Tar indicates a man of bad character. Seeing it indicates worry and grief.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Tar is interpreted as worry. Whoever sees himself walk on it will be afflicted with worry.