Partyasaurus Share definition Flag 1. A creature whose main purpose in life is to party. 2. Any beast who enthusiastically indulges in such activities. Damn that girl loves to party, shes such a partyasaurus! Partyasaurus by sweise May 29, 2010 0 0 Get merch Get the Partyasaurus mug. Buy Now — $32.95 See more merch