I've heard it being called many things, but not specifically "mad oxygen", but commonly "laughing gas". https://erowid.org/chemicals/nitrous/nitrous.shtml https

I've heard it being called many things, but not specifically "mad oxygen", but commonly "laughing gas". https://erowid.org/chemicals/nitrous/nitrous.shtml https://erowid.org/chemicals/nitrous/nitrous.shtml