sydnasty 

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!

sydnasty by sydneyrocks456 May 18, 2011

Sydnasty 

she's pretty much just that bitch. loud & obonoxious of course. def bangable. a freak, not a hoe.

"ayo, whaddup sydnasty?!"

Sydnasty by playaplayaaa January 24, 2010