Dee Baba is perceived as the protector of the land from dangerous forces. Some sources state that he takes the form of a white man on a black horse. This man resembles a colonial slave master who rides on a horse through a sugarcane plantation. He has a whip in one hand and a chain in the other. Other sources claim that Dee Baba takes the form of either a black rooster or a black dog.
The spirit of Dee Baba is fed once a year (usually in January) or periodically. He is given biscuits (salted crackers), salted butter, white rum, lit cigarettes and a burning deya (clay lamp) or candle on a sohari leaf (similar to a banana leaf) in the bushes. This type of offering is called sadaa (vegetarian). Non-vegetarian devotees offer canned sardines or a black cock (rooster), or a goat or a hog (pig). This type of offering is called satwick (non-vegetarian).
These offerings are made mainly by farmers who would pray to reap an abundant harvest and prevent thieves from stealing their crops. Property owners also make offerings to Dee Baba to protect their house and land from envious neighbours and competing relatives. Others make sacrifices to Dee Baba to obtain health and happiness.
Influenced by East Indian diaspora, different name for incarnation of the Hindu God, Shiva also known as Kal Bhairav/Bhairo.
Sources: Wikipedia, Google Images, http://www.tntisland.com/folklore.html.