Yes Amyl Nitrate is usually what we call poppers, you take a whiff and it gets your ass loose (supposedly) and a head rush, which is why they're popular in gay culture. I'm not a fan. I personally don't allow poppers in My sessions because the smell gives Me a massive headache just being in the same room. Plus its annoying to have someone tied up begging for another hit of poppers every 5 minutes. I'm not an expert on the side effects but I would suspect they are not great! Stick with anal-eaze if you want some help loosening up. As for the headrush, there's plenty of other drugs that are less damaging.

As DommeLynx said, They're using the word 'gooning' because 'poppers' is probably banned, Its a combination of forced intox/hypno/joi scene it sounds like