A monger is a person who sells or promotes a specific product, sometimes the term is used in a negative way, but it can also be used to describe those who sell something commercially, such as a fish monger.
The term you have asked about is a derogatory name that is sometimes used by a bully to belittle someone else. Most bullies do this to make themselves feel big and it is the result of an inferiority complex.
Turd is also a vulgar word and should not be used in polite conversation to reference feces.
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A Fish Monger sells fish.
Adrian Monger was born in 1932.
Hate-Monger was created in 1963.
Dennis Monger died in 1990.
Iron Monger was created in 1982.
The cast of Monger - The Fall - 2013 includes: Zet as Clones Aidenn Queen as Monger
A person who sells cheese. My name is Cheese Monger! On this site!
M. Monger has written: 'Casework in probation'
George Monger was born on 1840-03-03.
John Monger was born on 1831-01-25.
John Monger died on 1892-12-23.