v. The act of sneezing (often a suppressed half sneeze) which is then followed up with a rowdy and/or giddy exclamation of "WOO!"
n. The raddest of sneezes. The party sneeze embodies one's love for both life and sneezing. Often a party sneeze can be brought on through the consumption of chocolate chip ice cream sandwiches.
This party is especially delightful and has put me in the grandest of moods! Oh my I must sneeze now! Achoo-WOO! Golly that was a stellar party sneeze!