Dreams dictionary: Tar
Dreams dictionary: Interpretation 1
To see tar in your dream signifies your dependency on something or someone. You need to be more self-reliant. Tar is also symbolic of the subconscious and the negative aspect of the Self.
Dreams dictionary: Interpretation 2
In particular, to dream that you are tarred and feathered symbolizes pent up anger, hostility and shame. You are punishing yourself.
Dreams dictionary: Miller Dream Interpretation
If you see tar in dreams, it warns you against pitfalls and designs of treacherous enemies. To have tar on your hands or clothing, denotes sickness and grief.