Something you can't rightly remember or pronounce, possibly in another language:
Senzonbakurakagayoshi! 😱 Or Zanpaku-to! any of those swords would be bad.
BANKAI! works though.
One for you Otaku out there.
Antidisestablishmentarianism.
The worst safety word?
"More"
There. Nuff said.
:stickout😉
We don't have a safeword because we know each other well enough to know when it's too much. 😍
Mine is phone. Usually because if someone is laughing too hard, a phone might ring. "HAHA PHOOONE!" and gives the tickler some pause to listen.