This originated in Pittsburgh Pa: Slang for "you all" or yall

The soft, spongy central cylinder of parenchymatous tissue in the stems of dicotyledonous plants; The soft inner part of a feather, a hair, etc; The important or essential part; essence; core; heart: the pith of the matter;
Significant weight; substance; solidity: an argument without pith.

to be the cooliest cat in the neighborhood. Or a gangster.

A weapon used to hurt others.It is and extremely dangerous and has a wooden stick and a nail jammed through it.