Dumpster Dipping

When you throw your dipping sauce into the trash can and it stands perfectly upright inside and you realize you still had one more fry left so you reach your arm into the trash can to dip your fry.

Originally created by Drillpoint's BITTER1, this term has come to mean to include the act of passing by a large garbage pile by pure chance and finding something really cool that is still in decent shape, taking it home, cleaning it up & basically acquiring free goods.