DirtBack
Someone that gets dirt on their back from riding too fast on a motorbike.
Erik had a dirtback from riding too fast on the trail.
dirtback
The after effects of debris (mud / dirt) on riding gear (primarily on their backs) after a long day of dirtbike riding.
I saw 4 dirtbacks climbing a very steep hill on their dirtbikes.
dirtback
Low-class, trailer trash fuckhead.
Goddam dirtback, your mangy pit bull shat on my lawn again!
dirtback day
Three days out of the week put aside for extreme dirtbaggy problems. Days are usually Monday, Tuesday and Thursday. Continue until a significance in dirtbaggy problems is achieved.
Happy Dirtback Day! Every Mon, Tues and Thurs.
dirtback riding
Referring to the dirty back participants revive while having intercourse in a forest or field.
Dude, I can't wait to go dirtback riding with my girlfriend tonight