FunnyAssMatt's definitions
To consume as much alcohol as you can until you splatter on any Saturday of the year. Vomiting, blacking out, and/or passing out can be considered "getting splattered".
Matt : Hey! Splatter day this weekend at my place?
Chase: I don't know man. Remember what happened last Splatterday?
Chase: I don't know man. Remember what happened last Splatterday?
by FunnyAssMatt February 7, 2015
Get the Splatterdaymug.