This is a prank where you drive around town and pick up all the free stuff people leave on the side of the road. You then take this crap, pack it up in a truck, and then throw it on another lawn.. Then you put a 'yard sale' sign on their lawn, and as you drive away you scream YARD SALE!!!!!!!!!
P-Niz: Hey Trackus, you know what was fun?
P-Niz: When we dumped all that crap on that bitches lawn
Trackus: Oh Yeah! we totally got her with the Yard sale