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1.
she's pretty much just that bitch. loud & obonoxious of course. def bangable. a freak, not a hoe.
"ayo, whaddup sydnasty?!"
by playaplayaaa January 24, 2010
 
2.
Means something or someone that is really cool and awesome. Something so amazing, it deserves its own name.
originated form the word, sick-nasty.
Whoa, dude, your shoes are sydnasty!
by sydneyrocks456 April 26, 2011