where did the phrase "piss poor" come from

Lol. Nice history lesson.

Learning history is fun...ummm sort of. Creating history however is quite interesting.

My question is;

What are some of the cliché phrases or creative etymology (FL almost called nerd alert on you there) that will come from our living days?

Basically, what future phrases do you think folks will be researching the origin of, only to find out it came from our lifetimes..?..

Hobbying .