I went ahead and submitted “redneck grenade” to Urban Dictionary which may or may not be based on personal experience. You reckon they’ll accept it?

redneck grenade

• define: The improper disposal of solid human waste when camping whereby the producer of said waste tosses it into the camp site of unsuspecting fellow campers.
• example: When camping along the Duck River in Tennessee, Billy Bob pooped on a plate and tossed the redneck grenade like a frisbee onto the river bank where canoers later discovered it in horror.