Originally Posted by sunshower
This would be my guess, too. You have to choose a word that doesn't sound like another word and wouldn't be misheard as a sexual term. Saying "no" or "stop" would only fuel the fire if they're into submissive sex at the moment. Touches don't work, either.
13 Mistake to Avoid When Selecting a Safe Word:
1. Cognitive dissonance can be problematic. For example, using “More, More, Harder, Harder,” “Green Light,” or “Yes! Yes! Yes!” as a Safe Word may prove sufficiently confusing to evoke a transient but still uncomfortable delay in execution of the the desired response,
2. Homographs are iffy. Your more exacting Doms won’t find “You say tomato, I say tomato” all that amusing.
3. Likewise, homonyms (e.g., plays on “bear” the burden and “bare” your ass) can be tricky. I reference Master Murphy’s Law: Any safe words that can be confused will be confused and its corollary: “Momentary confusion” takes on a entirely different meaning when the “momentary” part occurs during a flogging.
4. Multi-syllabic words most often found in medical or scientific literature or novelty books about word play (e.g., “Pneumonoultramicroscopicsilicovolcanoconiosis,” “hepaticocholangiocholecystenterostomies,” “floccinaucinihilipilification,” and the like) are not ideal. Even if you can routinely recall such monstrosities, it’s showing off, and, believe me, nobody likes a smart ass sub.
5. Safe Words that aren’t words (e.g., “833646520034″) fall into the same category as #4.
6. While dramatic and emphatic, exclamations such as “Ouch,” “Damn, that hurts,” and “What the heck do you think you’re doing?” can be misunderstood.
7. The subjunctive mood (e.g., “It’s as though I can’t take any more” or “I wish it would quit hurting”) is typically inappropriate as ones Safe Word.
8. ” ” It didn’t work for Prince and it won’t work for you.
9. AAAA. (”Assiduously Avoid Acronyms, Asshole”). “NGSCB” may mean “Next-Generation Secure Computing Base,” to you, but does your Dom know that?
10. Think twice before choosing tricky proper names (for example, names of towns such as Unalakleet, Alaska or Prem Nagar, India and especially those vowel-deficient designations of Welsh villages such as Cwmtwrch). A good rule of thumbscrews is that if you can’t grunt the Safe Word intelligibly with a gag in your mouth, then it’s not really safe, is it?
11. Using something on the line of “Is that the best you can do, Mistress?” and “You’re such a wuss, Master” is just asking for trouble. (Handy memory aid: Taunts are for Tops; Begging is for Bottoms)
12. Some words and terms just don’t fit. For example,
• “Hamiltonian Federalist Principles”
• “Willing suspension of disbelief”
• “Bernoulli’s Principle”
• Any phrase which includes the words “butterfly” or “unicorn.”
• Anything in the form of a rhyming couplet
• Almost all scripture from the New Testament (yes, even the modern translations)
13. “Fuck You, Master” is probably best left to the very experienced, hard core players.