Your brain will swell, and you will die from that. It will be very fucking painful. NaCl has a LD50 for humans around 1-3g/kg you need to be well above that to ensure death. (SN LD50 dose for 80 kg human would be around 6 gram, still it's recommend to take 20-25g of it. It's not a reliable method since you will likely puke your guts out if you take that much salt, and don't forget the copious amounts of water to even dissolve it.
So let's just say you are 80 kg heavy, now you would need around 4 times as much NaCl for anything close to a reliable death (still uncertain as all hell), so around 26g/kg. So yeah good luck trying to eat 2 kg of salt. Without sufficient water, it's just a plain stupid idea. Yes you could always try to drink soy sauce, a few liter of it, still not smart.