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1.
Usually refers to a photo that has been enlarged so that it is very pixel-y, and the quality is not very good.
"dude, that photo is a pixel party!"
by sammiee** May 08, 2008
 
2.
A Photography or Photo-shoot themed party or celebration. Typically for children but also adults.
The kids had a fantastic time at their pixel party this weekend.
by JPZ1 November 13, 2011