verb

• (transitive) To eject forcibly and in a stream,
  "But you get to the beach via monorail and you get to the sand and look out to the ocean and all you see is oil tankers and factories spewing smoke on the horizon. It was like some sort of futuristic dystopia."
• (intransitive) To be forcibly ejected.
  "The blow is not as severe as those to his leg. It is meant only to break, not crush. Blood and internal fluids spew from his nose."
• (transitive) To speak or write quickly and voluminously, especially words that are not worth listening to or reading.
  "Set such a program running and it will continue to spew out sentences until you shut it down."
• (intransitive) To be written or spoken voluminously.
  "The lies continued to spew forth."

noun

• (slang) Vomit.
  "Just after you've din'd, take a dish that is large, And into it what you have eaten discharge; Then get all the rest that are at the table, to spew in the same as long as they're able; Let them strain very hard, 'till all is brought up, For the more spew there is, the better the soup;"
• (slang) Ejaculate or ejaculation.
  "Sea urchins, for example, release between ten and one hundred billion sperm with every ejaculation. That's two orders of magnitude more than the few hundred million sperm per spew an average human bloke can dish out."