A shit so large, it rips one or more of the circular muscles in the anus on its way out. This usually causes bleeding and mild to intense discomfort.
Male 1 (In the restroom): Call an ambulance!
Male 2: Why?
Male 1: I just had a sphincter-buster! My anus is bleeding and I cant sit down!
Male 2: Why?
Male 1: I just had a sphincter-buster! My anus is bleeding and I cant sit down!
by BobotheClown December 14, 2008
Get the sphincter-buster mug.Sphinkter Busters are large fingers from a large hand capable of causing serious damage to ones rectum
by kevtherev April 24, 2010
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