Randy Lee Tenley, 44, of Kalispell, Mont., was pronounced dead at the scene near Flathead Lake in northwestern Montana after the stunt late Sunday night.
"This is one of the dumbest things I've ever seen. Really," Montana Highway Patrol Lt. Col. Butch Huseby tells the Los Angeles Times.
Tenley had donned a Ghillie camouflage suit covered in thick foliage-like material that's used by hunters and military snipers and dashed onto the two-lane road around 10:30 p.m. Two cars, both driven by teenage females, slammed into him.
A friend who was with him told police about the intended Bigfoot hoax. Authorities are investigating whether the men had been drinking.