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1.
The process of being penetrated in the booty hole while giving birth.
Christopher is a firth baby.
av CupDude 17 februari 2009
 
2.
A derivative of filth. Meaning lower than specks of dust on your shoes.
Man, that is pure firth!
av Crismon 16 juni 2003
 
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