This is the 7212th most frequent German word.
gallus
"Gallus" is a colloquial term in German dialects, meaning "cocky," "cheeky," or "bold."
Here, 'Gallus' refers to a proper noun, the name of a district.
Der Stadtteil Gallus in Frankfurt ist bekannt.
The Gallus district in Frankfurt is well-known.
In this sentence, 'Gallus' is used metaphorically or poetically as a noun meaning 'rooster'.
Der Gallus war für seinen Mut bekannt.
The rooster was known for its bravery.
Here, 'gallusartig' constructs an adjective from the base 'Gallus', implying traits associated with it.