Home › Words › S › sidesplittersidesplittersidesplitter means an exceptionally funny joke, remark, or happening.Among words judged in Lexicurio's Arena, sidesplitter ranks #3,411 of 42,747 for Qualifying.EtymologyFrom side + splitter.nounAn exceptionally funny joke, remark, or happening.Definitions & examples from Wiktionary (CC BY-SA 3.0).