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1.
When a long nippled woman cups her breast and the nipple pokes through between her fingers and resembles a sixth finger.
Man, I didn't know that girl had no top on, I thought she was sportin a six finger on a titty grip.
by Land o the Richwa July 08, 2009
 
2.
A way to describe somebody who is seen as being inbred i.e. shagging members of your family.
It is a myth that inbreds end up with six fingers
Guttin
"He's got six fingers mate!!"
by Hopenessbla November 09, 2007