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1.
Originally used by slaves to address their fiendish masters on the plantations, today, "massah" is used to address someone behaving in an obstinately bossy manner, especially if you think it's not their place to do so.
Wife: "Today I need you to go shopping, mow the lawn, wash the car, comb the dog, clip the cats' claws etc..."

Husband: "Yes massah"
by Spellnik September 29, 2007
 
2.
The proper way for a black male or female to address a superior being, such as a white or East Asian person. Derived from the word master by mangling it with a black tongue.
Clean my boots, African-American, er... person. Will you remember that five minutes from now?

-yesss massah...
by apecontroller December 06, 2010
 
3.
To fuck a black chick (usually a waitress or fast food worker) the same night she serves you dinner.
When she was handing me those chicken McNuggets I knew I had to Massah that!
by Big Droz June 24, 2009