When something spews out a substance or when a substance spews from something, the substance flows out quickly in large quantities. The volcano spewed out more scorching volcanic ashes, gases and rocks Leaking oil spewed from the tanker
eject the contents of the stomach through the mouth; "After drinking too much, the students vomited"; "He purged continuously"; "The patient regurgitated the food we gave him last night"
eject or send out in large quantities, also metaphorical; "the volcano spews out molten rocks every day"; "The editors of the paper spew out hostile articles about the Presidential candidate"