When a vehicle cuts you off on a snow covered road and sprays salty white shit all over the windsheild.
Fuck that dude in that truck just sprayed me with a road load! Turn on the wipers
Roadside fecal blowout; the need to blow out your ass on the road, to take an unexpected fast shit while driving.
"Oh my God, pull over, I got a road load comin' on!"