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1.
Someone who has nothing to do and asks you where all the hottest parties and events are throughout the year.

or

A lame that is out of the loop and never knows when, where, or what time the party is.
Party Poacher: Yo! Whats happening tonight?

Party Promoter: Im not telling your lame ass nothing. Got damn Party Poacher!
by Deon Tae August 06, 2009
 
2.
Fake ass person who mooches off a person and offers an exciting, out of the ordinary, experience while projecting themselves as a cool person that should be talked about to everyone elses friends.
D Web and his friends are such party poachers.
by Will, Myles, and Taylor April 05, 2007