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2.
A derivative of filth. Meaning lower than specks of dust on your shoes.
Man, that is pure firth!
av Crismon 16 juni 2003
 
1.
The process of being penetrated in the booty hole while giving birth.
Christopher is a firth baby.
av CupDude 17 februari 2009
 
3.
Puss-filled bubble, usually located around the anus.
"Yo, is that Firth in that Chevy?"
av Dr. Curtis 6 december 2003
 
4.
a bacterial disease
skinny white boy who looks like he has down syndrome = firth
av sam excellent 4 december 2003