Source: The Great Interpretation of Dreams (Ibn Sirin)
Touching the Black Stone indicates following a scholar or pledging allegiance to a leader. Not kissing it may indicate incompleteness of the matter.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
It may indicate following the Sunnah without reaching its perfection.
Source: Signs in the Science of Expressions (Ibn Shaheen)
It is interpreted as goodness but نقص (deficiency/incompleteness) in its completion.