The best replacement for throw up is spit up.

The best alternatives to throw up are rated as following:
★★★★★  spit up
★★★  puke
★★★  vomit
★★  puck
★★  throw out
★  gag
★  throw-up

Your alternative for throw up is not listed? Suggest!
Speaking about throw up, one probably shouldn't forget about salt water.

Other search terms related to throw up and their ratings are:
★★★★★ salt water
You have in mind a companion for throw up and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of throw up in all years. Click on graph for more.
throw up
spit up
puke