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1.
adj. -- Uppity, pretentious, stuck-up, conceited. Acting as if you are better than someone else. To "put on airs." Often preceded by the word "high."
Mariah been acting all high siddity since she won that $20,000 in the lottery.
Why is Aisha being all siddity just cause that dude from BET (Black Entertainment Television) went out with her?
de Khalisah 5 avril 2006
 
2.
Adjective describing an African American, often a female, who acts as if she is superior to others, especially other African Americans. Synonyms: stuck-up, arrogant, aloof.
Many American Blacks dislike Condoleeza Rice because they think she acts too siddity.
de johnnybb 7 juillet 2006