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1.
a black woman, depicted as rotund, homely and matronly.

The mammy is an archetype, portraying a domestic servant of African descent who is generally good-natured, often overweight, and loud. The stereotypical mammy is portrayed as obsequiously servile or acting in, or protective of, the interests of whites

Although the word "mammy" is a variant of "mother" and was common in North America, it is now rarely used and typically considered an ethnic slur. In parts of the UK however, mammy is still widely used as a synonym for "mother" by young people, without any racial connotation.
Quaker Oats recently gave their "Aunt Jemima" pancake syrup bottle a makeover to remove the racially insensitive mammy image.
by PCone November 14, 2009
 
2.
Mammy - term has evoled quite drastically from the early late 19th - early 20th century. When the term was used to describe a black woman in a dominant white household that took care of the children and housework to create better life for her own children.

However, the term in present time is used to describe an unfit, lazy, uncaring, wannabe grown, irresponsible or unruly mother.
Jose grabbed her child and all the child's toy and place the child inside the house unattended without telling anyone. Just to go score some weed with a somewhat complete stranger. Now that's a mammy!
by kCole May 15, 2008
 
3.
Another term for mother
I am going to go visit my mammy.
by Kite Bomber April 13, 2005
 
4.
a synonym for a womens breasts.
she has huge mammies
by paul12345654364 February 01, 2007
 
5.
An exclamation that is used to identify an unintended subtle sexual innuendo.
You are driving with one or more friends and pull into a parking lot. You see a sign that says "Use Rear Entrance" and exclaim "MAMMY! Alternately, your roommate comes back from class and is drenched from a rainstorm. She says "Oh my God, I am so wet!" and you say "Mammy!"
by heather, dan and nicole August 31, 2007
 
6.
a derrogatory term often said towards "ghetto" women who are characterized by their black air force ones, large hoop earrings, overuse of makeup, and over-dyed hair.
The ghetto mammy was standing on the street corner waiting for some business.
by C-Dizzizzle May 13, 2009
 
7.
The best grandmother in the whole damn world.
Dude, Mammy totally bought me a pony for Christmas.
by Cadaver Chick February 13, 2010