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4.
(adverb/adjective)A combination of silly and dirty; root phrase: "so dirty."
Paris, she actin' sedity!
by Peter Epp May 11, 2005
 
1.
uppity..stuck up...to think that you are better than others...snoodity, uptown, rich acting, fake
She really is sedity...
by protector February 06, 2003
 
2.
Adjective.

1. To think so highly of oneself that all others are viewed as being separate.

2. To think you're better than all others and that you are all that matters.

3. High maintenance, uppity.

From the root "sedition" noun, which Merriam-Webster defines as "incitement of resistance to or insurrection against lawful authority"
Vanessa thinks that her new prom gown makes her better than everyone else at school. Just wait 'till that sedity girl sees my tight 'fit!
by ethermagus January 17, 2010
 
3.
short for "seditious" adjective which the Oxford American Dictionaries defines as:
inciting or causing people to rebel against the authority of a state or monarch : the letter was declared seditious.

ORIGIN late Middle English (in the sense violent strife ): from Old French, or from Latin seditio(n-), from sed- ‘apart’ + itio(n-) ‘going’ (from the verb ire).
That sedity girl wasn't going to listen to no one!
by Tim Blackburn December 15, 2005