To hear or see a snake hiss in your dream is a warning that you may need to control your temper and/or your impulsive actions in order to avoid antagonizing someone whose respect you value. Human hissing is a dream of contrary; the meaning is the opposite of what you might think. If you did it, you can expect to be caught in an embarrassing blunder; if you were hissed at, your progress toward your goal will be slow but steady.