A derivative of filth. Meaning lower than specks of dust on your shoes.
Man, that is pure firth!
додав Crismon 16 Червень 2003
3 more definitions
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
a bacterial disease
skinny white boy who looks like he has down syndrome = firth
додав sam excellent 4 Грудень 2003