What is this??
This is a type of perennial native plant called Pokeweed. It's berries, which turn a dark purple and hang in long drupes are relished by songbirds and other wildlife, which is how it tends to move around.
It grows from an eventually thick taproot. When you can get in there you will want to drive a shovel as deeply as you can and then pull back and rock the root out, or it will return.
Here is our page about it: https://extension.umd.edu/hgic/topics/pokeweed
I guess this a weed??
Some native plant gardeners do keep them if they pop up, but most gardeners consider them weeds and remove them. The older it gets, the harder it will be to remove the roots because they grow to be substantial.