A derivative of filth. Meaning lower than specks of dust on your shoes.
Man, that is pure firth!
ayon kay Crismon ika-16 ng Hunyo, 2003
The process of being penetrated in the booty hole while giving birth.
Christopher is a firth baby.
ayon kay CupDude ika-17 ng Pebrero, 2009
Puss-filled bubble, usually located around the anus.
"Yo, is that Firth in that Chevy?"
ayon kay Dr. Curtis ika-06 ng Disyembre, 2003
a bacterial disease
skinny white boy who looks like he has down syndrome = firth
ayon kay sam excellent ika-04 ng Disyembre, 2003