A derivative of filth. Meaning lower than specks of dust on your shoes.
Man, that is pure firth!
додав Crismon 16 Червень 2003
The process of being penetrated in the booty hole while giving birth.
Christopher is a firth baby.
додав CupDude 17 Лютий 2009
Puss-filled bubble, usually located around the anus.
"Yo, is that Firth in that Chevy?"
додав Dr. Curtis 6 Грудень 2003