If you don't know what Shibari is, don't try looking it up on Wikipedia at work. Do it when you get home.

To save me the hours and hours of curiosity, does someone want to give a brief and work-safe summary of what this particular activity is?

Artfully tying people up. It's sometimes associated with nudity, which is probably why people have added disclaimers; although I can't imagine a workplace that'd penalize a simple google search for it while allowing HN.

Japanese bondage, mostly with ropes. That's what Wikipedia says.

Dude. Some of us are at work.