Throw Up Meaning

(now colloquial) To vomit.

Example: Used other than as an idiom: see throw,‎ up.
Arthur Conan Doyle
The servant who had first entered had thrown up the window […]
  The baby threw up all over my shirt.
  That cat is always throwing up hairballs.
To produce something new or unexpected.
  This system has thrown up a few problems.
To cause something such as dust or water to rise into the air.
  The car wheels threw up a shower of stones.
To erect, particularly hastily.
2001, Diane Kennedy, Loop-Holes of the Rich: How the Rich Legally Make More Money & Pay Less Tax, Warner Books, ISBN 0446678325, page 70,
  In other words, a business can throw up a huge detour sign in the way of the government.
2007, Marissa Monteilh, Dr. Feelgood, Kensington Books, ISBN 0758211228, page 27,
  The deal was that if anyone started catching feelings, he could throw up a stop sign and the other would honor it.
To give up, abandon (something).
2011, Alan Bennett, "Baffled at a Bookcase", London Review of Books, XXXIII.15:
  In 1944, believing, as people in Leeds tended to do, that flying bombs or no flying bombs, things were better Down South, Dad threw up his job with the Co-op and we migrated to Guildford.
To display a gang sign using the hands
2005, Brandon Bennett, Moon in Gemini, iUniverse, ISBN 059536442X, page 56,
  Why don't you go on and throw up ya gang sign. Represent your hood, homey?