Engineering term defining any kind of crapppy material / alloy that is not up to the job it's supposed to do.
This includes also the material used plastic parts often used in automotive for knobs and handles that will snap or shatter during normal use.
A picnic that is shitty, generally consisting of cheap food obtained from a fast food restaurant or vending machine, and eaten in the grass or on the ground typically close to a large road or other inconvenient place. Commonly occurs when drunk, lazy, homeless, or any combination of the three.