The sound a mobile phone makes while ringing when it has been set to vibrate. An unintentional side effect of not taking the phone out of silent mode, it's reminiscent of the "mmm-mmm-mmm" sound a bound and gagged hostage makes in a movie when trying to get attention from a rescue squad.
Dude, your phone has been ringing nonstop - doing the hostage on the table while you were off dropping that deuce.
Mindless fools in Counter- Strike, usually scientists who run into walls and whisper so that the T's can hear them all the way across the map. Who certified these guys to be scientists?
Usually refered to as "hosties"