I think I remember seeing someone with a fullbody item that was Giger themed but I don't remember who. Does anyone know what this item is?

It's a skin from the HA zapper, not an item !

hot dang ok. Do you mind telling me how I would go along getting that skin then?

Right now you sadly can't. You have to wait until they open the pet zapper up for human zapping, usually during Morostide. It's just like the normal zapper but costs more (and obviously only zaps your HA).