Top definition
The finger that is used to insert into a sphincter. Commonly this finger has a slight discoloration to it, similar to that of a carmel choc bar
I noticed one of Bob's fingers were slighly discolored, that must be his sphincter finger.

Paul loved Bob's sphincter finger and how it made him feel when it is inserted into his sphincter
by Swine Doctor May 18, 2011
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