a word used in conjunction with s&m, consensual torture, bondage, etc - so that when you say "no" or "stop" in the heat of the moment, the other person can disregard it - the safety word is the serious-i-mean-it-now time-to-stop word. usually something ridiculus like Alabama.
"Why did Jesus die on the cross? Because he forgot his safety word."
9 Şubat 2005, Çarşamba