It sounds very racist.
This answer is from wiki answers. I also read that it is used in the Caribbean NOT in the USA. I
Niggeritis is the feeling of fatigue you experience after eating a large amount of food. The fatigue experienced leaves the "afflicted" person with the desire to sleep. Although people of all races experience this from time to time, it is more explicitly addressed in the black community, hence the term "niggeritis". The "itis" suffix of the word serves to classify it as if it were a medical condition, (i.e. sinusitis, bronchitis, etc.), whether it be a fictional condition or not. It is also sometimes called "ethnic fatigue" for those who like to be "politically correct".

1) There is a German proverb saying:
"nach dem Essen soll man ruhn oder tausend Schritte tun (Prov) after a meal one should either rest or take some exercise"
Source and further information:
http://dictionary.reverso.net/german-english/ruhen

This means that after a good meal, you have two good options: either you take a rest or you do some exercise (walk 1000 steps).


2) "niggeritis" refers to this: it is the feeling that you get after a good meal, that it would be good to have a little nap.

Moreover, this word includes racist stereotyping: it is supposed to be a bad thing, that particularly "niggers" allegedly often do: eat too much, and then go to sleep.


3) "refers to the feeling one gets after eating large amounts of food. often associated with the need to take a nap after eating.
"man, i think all that effin' food gave me a bad case of niggeritis""

"To feel sleepy after eating is referred to in and around the Caribbean
as having "niggeritis", a direct allusion to the lazinessof Africans.
------------------------------ ---
The dazed state of inactivity or sleep brought on by extensive over-eating, after the Trinidadian snake that devours small animals whole and lies in the same place for several days after, digesting; the politically correct or polite version is "Macajuel syndrome" of the more well-known but less socially acceptable "niggeritis"
I cannot attend the meeting this afternoon after lunch becuase of niggeritis."
Source and further information:
http://www.urbandictionary.com/define.php


4) The polite version "Macajuel syndrome" refers to the "Macajuel", which is a Trinidadian name for the boa constrictor.
"Other common names include "jibóia" (Latin American) and "macajuel" (Trinidadian, pronounced mah-cah-well)."
Source and further information:
http://en.wikipedia.org/wiki/Boa_constrictor

"After eating, snakes become dormant while the process of digestion takes place. Digestion is an intense activity, especially after consumption of very large prey. In species that feed only sporadically, the entire intestine enters a reduced state between meals to conserve energy, and the digestive system is 'up-regulated' to full capacity within 48 hours of prey consumption."
Source and further information:
http://en.wikipedia.org/wiki/Snake

It's when a black person feels tired after they eat.

LMFAO