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1.
A particular type of logic commonly used by niggers. The difference between nigger logic and "regular" logic is that arguments using nigger logic are logically deficient. They appear logical at first but on closer inspection they turn out to be totally illogical. Most people with average intelligence can spot nigger logic immediately but most niggers, along with retards of other races, can not.
Nigger Terrence Howard told Elle Magazine that he refuses to date women who don't use moistened tissue on visits to the toilet - as they are "not completely clean".
Quote (with example of nigger logic):

"If they're using dry paper, they aren't washing all of themselves. It's just unclean. "So if I go inside a woman's house and see the toilet paper there, I'll explain this. And if she doesn't make the adjustment to baby wipes, I'll know she's not completely clean."

According to this nigger logic, women who use toilet paper do not use wipes. Presence of toilet paper equals absence of wipes = nigger logic.
by Bobby Francisco III August 17, 2007
 
2.
When a black person tries to explain something, especially why he committed a crime or why he deserves something.

After failing a math test, X mombutha says "Man, my people were slaves once! I deserve an A. You racist."
At his trial for murder-rape, Rasheed excretia uses nigger logic when he claims "she felt on the nife. That white bitch begged me for my black pipe, then she felt on the nife over and over, 29 times. I sez 'whiite bitch, you drunk, you keep fallin on the nife!"
by Barry from Kenya January 13, 2011
 
3.
Thinking that expends the least amount of effort possible.

Thinking that encroaches on others and achieves subpar results.
Example of Nigger Logic:

Leroy: "Damn Rastus, you're still not done rebuilding that wooden fence?"

Rastus: "I'm done."

Leroy: "aight, I saw that huge piece of plywood and figured it was work-in-progress."

Rastus: "naw dawg, when I ran out of cedar fencing from Leroy's property, I finished the fence with plywood I found in my attic."

Leroy: "aight, aight"

Rastus: "where might a brother hook hisself up with some sheet rock? "
by brotherup October 04, 2013