This is the 1944th most frequent German word.
dicke
"Thick" or "fat" (depending on context).
The word 'dicke' in this context is used as an adjective describing the layer of chocolate as being thick in terms of physical thickness or depth.
Der Kuchen hat eine dicke Schicht Schokolade.
The cake has a thick layer of chocolate.
In this context, 'dicke' is used in a figurative sense to describe the closeness or strength of the friendship, not a physical characteristic.
Wir sind seit Jahren dicke Freunde.
We have been close friends for years.
Here, 'dicke' acts as an adjective to describe a winter jacket as being thick, emphasizing its insulating properties for warmth.