1. Of a liquid or gas, to pour or gush out (from something). Heavy rains overloaded the local sewer lines, causing sewage to spout out of all the toilets in the building. Eventually the pressure was so great that a crack appeared in the container and steam began spouting out.

2. To expel or eject some liquid or gas from something in a stream or gush. In this usage, a noun or pronoun can be used between "spout" and "out." The pot started spouting out steam as the contents inside began to boil. Boiling-hot steam spouted from the fissure in the ground.

3. To utter something very quickly or abruptly, especially something that is unsolicited, inappropriate, or not meant to be shared. In this usage, a noun or pronoun is used between "spout" and "out." My uncle when off on a tirade, spouting out the most awful invectives imaginable. Suddenly, apropos of nothing, she spouted a wedding proposal out, which took me completely by surprise. Once he gets going, Stephen will start spouting facts and figures out so fast that it will make your head spin.