A derivative of filth. Meaning lower than specks of dust on your shoes.
Man, that is pure firth!
por Crismon 16 de Junho de 2003
The process of being penetrated in the booty hole while giving birth.
Christopher is a firth baby.
por CupDude 17 de Fevereiro de 2009
Puss-filled bubble, usually located around the anus.
"Yo, is that Firth in that Chevy?"
por Dr. Curtis 06 de Dezembro de 2003