A misspelled form of "parties". This term is often used by posers who take pictures of themselves in the same outfits in their own bathroom and pretend each one is from a different party in order to make their boring lives seem less lame.
The term is also used by pre-teen girls who have not yet realised that misspelling as you type is not cute.
Note: A regular party-goer knows how to spell "parties".
Me N MaH GuRLZ b aT TeH PaRTieZ!!11