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A movie marathon of nothing but horror/thriller movies in which there are many scenes with excessive amount of blood, guts, and gore
Jenny: OMG Splatterday movies are so gross

David: Come on they're not that bad, I'm pretty sure the doctors will be able to sew her eyelids back on.
by McStreamy June 10, 2012
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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?
by FunnyAssMatt February 07, 2015
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