Slang To vomit or experience vomiting.(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "upchuck" in a sentence
"Your mama's wiping away the banana with her hand, laughing with the people sitting next to her because baby upchuck is just so adorable."
"Ugh, I even thought of the word "upchuck" listening to Lieberman tonight"
"She battles to get out from under the mosquito net so she can escape outside and avoid others seeing her upchuck."